85 + Interview Questions in Profiling in R Programming Page 1 InterviewSolution

1.	If I want to save a plot to a PDF file, which of the following is a correct way of doing that?(a) Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()(b) Construct the plot on the PNG device with png(), then copy it to a PDF with dev.copy2pdf()(c) Open the PostScript device with postscript(), construct the plot, then close the device with dev.off()(d) Open the screen device with quartz(), construct the plot, and then close the device with dev.off()I have been asked this question in a job interview.Question is from Exploratory Data Analysis topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» Correct OPTION is (a) Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf() EXPLANATION: With the PAR( ) function, you can include the option mfrow=c(nrows, ncols) to create a matrix of nrows X ncols plots that are filled in by ROW.

Discussion

2.	____________ produces one-dimensional scatterplots.(a) xyplot(b) stripplot(c) barchart(d) bwplotThis question was addressed to me in semester exam.This intriguing question originated from Exploratory Data Analysis topic in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» RIGHT option is (B) stripplot Explanation: This function ALONG with other high-level Lattice functions, respond to a common SET of ARGUMENTS.

Discussion

3.	Which of the following is a principle of analytic graphics?(a) Don’t plot more than two variables at at time(b) Make judicious use of color in your scatterplots(c) Show box plots (univariate summaries)(d) Show causality, mechanism, explanationI had been asked this question in a national level competition.My question comes from Exploratory Data Analysis topic in portion Profiling, Simulation and Data Analysis of R Programming
Answer» Correct OPTION is (d) SHOW CAUSALITY, mechanism, explanation To explain I would SAY: Only do what your tools allow you to do.

Discussion

4.	Which of the following function works similar to separate()?(a) extract()(b) gather()(c) sep()(d) separate()I had been asked this question by my college director while I was bunking the class.Question is taken from Data Wrangling topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» Correct answer is (a) EXTRACT() EASIEST explanation: extract() works in a SIMILAR WAY.

Discussion

5.	_________ describe the type of plot you will produce.(a) geoms(b) ggplot(c) fplot(d) gplotThis question was posed to me during an interview.Origin of the question is ggplot2 topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» Right choice is (a) geoms Easy EXPLANATION: Geoms is short FORM for geometric OBJECTS.

Discussion

6.	_________ extract a subset of rows from a data frame based on logical conditions.(a) rename(b) filter(c) set(d) subsetThis question was addressed to me in exam.Question is taken from Data Wrangling in division Profiling, Simulation and Data Analysis of R Programming
Answer» The correct CHOICE is (a) RENAME Explanation: rename is used to rename VARIABLES in a DATA FRAME.

Discussion

7.	Which of the following d takes two columns and spreads them into multiple columns?(a) ggmissplot(b) printplot(c) print.ggplot(d) ggplotI have been asked this question in final exam.My doubt stems from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming
Answer» Correct ANSWER is (C) print.ggplot For explanation I would SAY: SPREAD() makes “long” data wide.

Discussion

8.	Point out the correct statement?(a) gather() makes “long” data wider(b) tidyr is a reframing of reshape designed to accompany the tidy data framework(c) there are two fundamental verbs of data tidying(d) tidyr and dplyr packages do not make use of the pipe operatorI got this question by my school principal while I was bunking the class.Question is taken from Data Wrangling topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» Correct answer is (c) there are TWO FUNDAMENTAL VERBS of data tidying To elaborate: In PARTICULAR, built-in methods only work for data frames, and tidyr provides no margins or aggregation.

Discussion

9.	__________ is interval represented by a vertical line, with a point in the middle.(a) geom_range(b) geom_pointrange(c) printplot(d) geom_contourI had been asked this question in an international level competition.My question is taken from ggplot2 topic in portion Profiling, Simulation and Data Analysis of R Programming
Answer» Right choice is (b) geom_pointrange To EXPLAIN: autoplot uses GGPLOT2 to draw a particular PLOT for an OBJECT of a particular class in a single COMMAND.

Discussion

10.	Logical flag is applicable to which of the following plots?(a) scatterplot(b) dotplot(c) xyplot(d) zyplotThe question was asked during an online exam.I need to ask this question from Exploratory Data Analysis topic in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» The CORRECT answer is (B) dotplot Easiest explanation: LOGICAL FLAG applicable to bwplot, dotplot, BARCHART, and stripplot.

Discussion

11.	which of the following functions can be used to finely control the appearance of all lattice plots ?(a) par()(b) print.trellis()(c) splom()(d) trellis.par.set()I got this question at a job interview.Enquiry is from Exploratory Data Analysis topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» Correct answer is (d) trellis.par.set() To explain I WOULD say: All high-level FUNCTION in LATTICE are GENERIC.

Discussion

12.	___________ is used to determine what is plotted for each group.(a) panel.expose(b) panel.impose(c) panel.superpose(d) panel.deposeI got this question in quiz.This intriguing question comes from Exploratory Data Analysis topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» The CORRECT option is (C) panel.superpose The best I can EXPLAIN: panel.superpose can be COMBINED with different panel.groups functions.

Discussion

13.	For barchart and _________ non-trivial methods exist for tables and arrays, documented at barchart.table.(a) scatterplot(b) dotplot(c) xyplot(d) scatterplot & xyplotI have been asked this question in semester exam.Asked question is from Exploratory Data Analysis topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» RIGHT answer is (B) dotplot Explanation: The numeric methods are equivalent to a call with no LEFT hand side and no conditioning variables in the FORMULA.

Discussion

14.	__________ produces bivariate scatterplots or time-series plots.(a) xyplot(b) dotplot(c) barchart(d) bwplotThe question was asked by my school principal while I was bunking the class.I want to ask this question from Exploratory Data Analysis topic in portion Profiling, Simulation and Data Analysis of R Programming
Answer» The CORRECT option is (a) xyplot Best EXPLANATION: xyplot has points that show the relationship between two sets of DATA. Optionally the y-axis may be scaled logarithmically. DOTPLOT produces CLEVELAND dot plots. barchart produces bar plots.

Discussion

15.	__________uses regex groups instead of a splitting pattern or position.(a) spread()(b) gather()(c) separate()(d) extract()The question was asked by my school principal while I was bunking the class.My question is taken from Data Wrangling topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» The CORRECT option is (C) separate() Best EXPLANATION: separate() allows you to tease columns apart.

Discussion

16.	Point out the correct statement?(a) Each row is an observation in tidy data(b) Each column is a variable in tidy data(c) Arranging your data in tidy way makes it easier to work(d) All of the mentionedThe question was asked during an interview.My question is taken from Data Wrangling in division Profiling, Simulation and Data Analysis of R Programming
Answer» Right choice is (d) All of the mentioned The explanation: When use TIDY data and tidy tools, you spend less TIME worrying about how to feed the output from one FUNCTION into the input of another.

Discussion

17.	Which of the following is an example of a valid graphics device in R?(a) A socket connection(b) A Microsoft Word document(c) A PDF file(d) A file folderI got this question during an internship interview.My question is taken from Exploratory Data Analysis in division Profiling, Simulation and Data Analysis of R Programming
Answer» Correct CHOICE is (c) A PDF file The explanation is: PNG file is ALSO valid graphics DEVICE.

Discussion

18.	Which of the following draws nothing?(a) geom_blank(b) geom(c) geom_bin2d(d) geom_contourI had been asked this question in unit test.I would like to ask this question from ggplot2 in portion Profiling, Simulation and Data Analysis of R Programming
Answer» Right ANSWER is (c) geom_bin2d Explanation: geom_bin2d adds heatmap of 2D BIN counts.

Discussion

19.	Point out the correct statement?(a) is.theme reports whether x is a real object(b) is.object reports whether x is a aesthetic object(c) qplot is used for quick plot(d) ggplot describe the type of plot you will produceThis question was addressed to me in an online interview.I need to ask this question from ggplot2 in division Profiling, Simulation and Data Analysis of R Programming
Answer» Correct answer is (C) qplot is used for QUICK plot For explanation: is.rel reports whether x is a real OBJECT.

Discussion

20.	__________ is used when you have variables that form rows instead of columns.(a) tidy()(b) spread()(c) separate()(d) gather()I got this question at a job interview.My doubt stems from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming
Answer» Right option is (b) spread() BEST explanation: You NEED spread() less frequently than GATHER() or separate().

Discussion

21.	________ add new variables/columns or transform existing variables.(a) mutate(b) add(c) apped(d) arrangeThis question was addressed to me in an online interview.The question is from Data Wrangling topic in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» CORRECT option is (a) mutate Explanation: ARRANGE is used to REORDER rows of a data FRAME.

Discussion

22.	What is a geom in the ggplot2 system?(a) a plotting object like point, line, or other shape(b) a method for making conditioning plots(c) a method for mapping data to attributes like color and size(d) a statistical transformationThe question was asked by my school teacher while I was bunking the class.The above asked question is from Exploratory Data Analysis topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» RIGHT OPTION is (a) a plotting object LIKE point, line, or other shape Easy explanation: The bar geom is used to produce 1d area PLOTS.

Discussion

23.	Which of the following is an example of a vector graphics device in R?(a) JPEG(b) PNG(c) GIF(d) SVGI had been asked this question during a job interview.I want to ask this question from Exploratory Data Analysis in section Profiling, Simulation and Data Analysis of R Programming
Answer» The correct OPTION is (d) SVG For EXPLANATION: SVG STANDS for scalable vector GRAPHICS.

Discussion

24.	__________ produces box-and-whisker plots.(a) xyplot(b) dotplot(c) barchart(d) bwplotThe question was asked in an interview.Enquiry is from Exploratory Data Analysis in division Profiling, Simulation and Data Analysis of R Programming
Answer» Right ANSWER is (d) bwplot The best explanation: Bwplot plots a series of VERTICAL box-and-whisker plots where the individual boxplots represent the data subdivided by the value of some factor. OPTIONALLY the y-axis may be scaled logarithmically. Dotplot produces CLEVELAND dot plots. Barchart produces bar plots.

Discussion

25.	Which of the following is true about the base plotting system?(a) Margins and spacings are adjusted automatically depending on the type of plot and the data(b) Plots are typically created with a single function call(c) Plots are created and annotated with separate functions(d) The system is most useful for conditioning plotsI had been asked this question in an international level competition.My query is from Exploratory Data Analysis topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» Right option is (c) Plots are created and annotated with separate functions For explanation I would SAY: Functions like ‘plot’ or ‘hist’ typically CREATE the plot on the graphics device and functions like ‘lines’, ‘text’, or ‘POINTS’ will annotate or add data to the plot.

Discussion

26.	Spread function is known as ___________ in spreadsheets.(a) pivot(b) unpivot(c) cast(d) orderI have been asked this question in final exam.I need to ask this question from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming
Answer» CORRECT option is (B) UNPIVOT For explanation I would say: Spread is known by other names in other places: it’s cast in reshape2, unpivot in SPREADSHEETS and unfold in databases.

Discussion

27.	Which of the following function takes multiple columns?(a) spread()(b) gather()(c) separate()(d) extract()The question was asked in an online quiz.My question is taken from Data Wrangling in division Profiling, Simulation and Data Analysis of R Programming
Answer» CORRECT option is (b) gather() Easiest explanation: gather() gathers COLUMN into key-value pairs.

Discussion

28.	How many functions exist for tidying the data?(a) one(b) two(c) three(d) fourThis question was posed to me in an international level competition.I want to ask this question from Data Wrangling topic in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» Correct OPTION is (c) THREE Easiest EXPLANATION: tidyr provides three main FUNCTIONS for tidying your messy DATA: gather(), separate() and spread().

Discussion

29.	Which of the following is complementary to tidyr?(a) geolr(b) dplyr(c) d3lr(d) gekl2The question was asked in an interview for job.This interesting question is from Data Wrangling topic in portion Profiling, Simulation and Data Analysis of R Programming
Answer» Right OPTION is (b) dplyr To EXPLAIN I would SAY: Its EASY to munge with dplyr.

Discussion

30.	Annotation of plots in any plotting system involves adding points, lines, or text to the plot, in addition to customizing axis labels or adding titles. Different plotting systems have different sets of functions for annotating plots in this way. Which of the following functions can be used to annotate the panels in a multi-panel lattice plot?(a) points()(b) panel.abline()(c) lines()(d) axis()This question was addressed to me during an internship interview.My question is from Exploratory Data Analysis topic in portion Profiling, Simulation and Data Analysis of R Programming
Answer» CORRECT option is (B) panel.abline() The explanation: panel.abline() is ONE of the most USED panel function.

Discussion

31.	Which of the following functions is typically used to add elements to a plot in the base graphics system?(a) lines()(b) hist()(c) plot()(d) boxplot()I got this question during a job interview.My doubt is from Exploratory Data Analysis topic in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» The CORRECT answer is (d) boxplot() The best explanation: text() also can be used to add elements to a PLOT. boxplot() used to add elements to a plot in the base graphics SYSTEM.

Discussion

32.	What does the ‘pch’ option to par() control?(a) the size of the plotting symbol in a scatterplot(b) the line width in the base graphics system(c) the orientation of the axis labels on the plot(d) the plotting symbol/character in the base graphics systemThis question was addressed to me during an online exam.My doubt stems from Exploratory Data Analysis topic in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» Correct answer is (d) the plotting symbol/character in the base GRAPHICS system Easiest explanation: R makes it easy to combine multiple PLOTS into one overall GRAPH, USING either the par ( ) or layout( ) FUNCTION.

Discussion

33.	What is ggplot2 an implementation of?(a) the Grammar of Graphics developed by Leland Wilkinson(b) 3D visualization system(c) the S language originally developed by Bell Labs(d) the base plotting system in RThe question was asked by my school principal while I was bunking the class.I need to ask this question from Exploratory Data Analysis in portion Profiling, Simulation and Data Analysis of R Programming
Answer» Correct OPTION is (a) the GRAMMAR of Graphics developed by Leland Wilkinson Explanation: The ggplot2 package, created by Hadley Wickham, OFFERS a powerful graphics LANGUAGE for creating elegant and COMPLEX plots.

Discussion

34.	Which of the following merges two variables into one?(a) spread()(b) gather()(c) separate()(d) unite()This question was addressed to me in my homework.My doubt stems from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming
Answer» The correct OPTION is (b) gather() BEST explanation: The UNITE() FUNCTION is a convenience function to paste together multiple VARIABLE values into one.

Discussion

35.	How many functions exist for wrangling the data with dplyr package?(a) one(b) seven(c) three(d) fiveThe question was posed to me in an online quiz.My query is from Data Wrangling topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» Correct choice is (b) seven Explanation: DPLYR PROVIDES seven main functions for TIDYING your MESSY DATA.

Discussion

36.	Bitmapped file formats can be most useful for ____________(a) Plots that may need to be resized(b) Plots that require animation or interactivity(c) Plots that are not scaled to a specific resolution(d) Scatterplots with many many pointsThis question was posed to me in an online interview.This interesting question is from Exploratory Data Analysis in division Profiling, Simulation and Data Analysis of R Programming
Answer» The correct ANSWER is (d) Scatterplots with MANY many points Easiest explanation: Scatterplots would be used FREQUENTLY for particular DIMENSION.

Discussion

37.	Which function opens the screen graphics device for the Mac?(a) bitmap()(b) quartz()(c) pdf()(d) png()The question was asked during an interview.This key question is from Exploratory Data Analysis in division Profiling, Simulation and Data Analysis of R Programming
Answer» Correct answer is (b) quartz() To explain I would SAY: quartz STARTS a GRAPHICS DEVICE DRIVER for the Mac.

Discussion

38.	Which of the following create a set of identity mappings?(a) ggplot(b) aes_all(c) aes(d) ggorderI have been asked this question in an interview for internship.My question is from ggplot2 in portion Profiling, Simulation and Data Analysis of R Programming
Answer» Right ANSWER is (d) ggorder To elaborate: CHARACTER VECTOR is given for the CREATION of IDENTITY.

Discussion

39.	Point out the correct statement?(a) tidyr and dplyr packages do not make use of the pipe operator(b) tidyr does less than reshape2(c) tidyr provides ability to string multiple functions together by incorporating %(d) tidyr does greater than reshape2The question was asked in unit test.My question is taken from Data Wrangling topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» Right answer is (B) tidyr does less than reshape2 For explanation I would SAY: Just as reshape2 did less than RESHAPE, tidyr does less than reshape2.

Discussion

40.	What is the role of exploratory graphs in data analysis?(a) They are made for formal presentations(b) They are typically made very quickly(c) Axes, legends, and other details are clean and exactly detailed(d) They are used in place of formal modelingI had been asked this question by my college director while I was bunking the class.My question comes from Exploratory Data Analysis topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» Right ANSWER is (b) They are typically made very quickly The explanation: EDA is used to SUMMARIZE MAIN characteristic of DATA.

Discussion

41.	Point out the correct statement?(a) gather() makes “wide” data longer(b) Two functions are present for tidy data(c) separate() makes “wide” data longer(d) spread() function takes multiple columnsThis question was posed to me in homework.Enquiry is from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming
Answer» RIGHT option is (C) separate() MAKES “wide” DATA longer The explanation is: Other names for gather include melt (RESHAPE2), pivot (spreadsheets) and fold (databases).

Discussion

42.	_________is new package that makes it easy to “tidy” your data.(a) tidy(b) tidyr(c) tidyneat(d) tidynrThis question was addressed to me in unit test.This question is from Data Wrangling topic in section Profiling, Simulation and Data Analysis of R Programming
Answer» Correct choice is (c) tidyneat The EXPLANATION: TIDY data is data that’s EASY to WORK in R.

Discussion

43.	______ display a smooth density estimate.(a) geom_density2(b) geom_density(c) aes_sdensity(d) geom_contourI had been asked this question in exam.My question is taken from ggplot2 in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» RIGHT OPTION is (b) geom_density The explanation: geom_density display a smooth DENSITY estimate. A smooth density estimate CALCULATED by stat_density.

Discussion

44.	Point out the correct statement?(a) The Rprofiler() function starts the profiler in R(b) Using system.time() allows you to test certain functions or code blocks to see if they are taking excessive amounts of time(c) R must not be compiled with profiler support(d) Rprofiler() tabulates how much time is spent inside each functionThe question was asked during an internship interview.This interesting question is from R Profiler topic in portion Profiling, Simulation and Data Analysis of R Programming
Answer» Right choice is (b) Using system.time() allows you to test certain functions or code blocks to see if they are TAKING excessive amounts of time Explanation: However, this approach ASSUMES that you ALREADY know where the problem is and can call system.time() on it that PIECE of code.

Discussion

45.	The elapsed time may be ________ than the user time if your machine has multiple cores/processors.(a) smaller(b) greater(c) equal to(d) nullThe question was posed to me during an interview for a job.This key question is from R Profiler in chapter Profiling, Simulation and Data Analysis of R Programming
Answer» Correct ANSWER is (a) smaller Explanation: The ELAPSED TIME may be greater than the user time if the CPU spends a LOT of time waiting around.

Discussion

46.	Which of the following is a plot to investigate the order in which observations were recorded?(a) ggplot(b) ggsave(c) ggpcp(d) ggorderThe question was posed to me in an interview.I'd like to ask this question from ggplot2 in division Profiling, Simulation and Data Analysis of R Programming
Answer» RIGHT choice is (d) ggorder The EXPLANATION is: ggsave SAVE a ggplot with sensible defaults.

Discussion

47.	________ is used for relative sizing of theme elements.(a) rel(b) size(c) relative(d) timrintervalThis question was addressed to me in an online quiz.Query is from ggplot2 topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» The correct ANSWER is (a) rel Best EXPLANATION: The syntax for rel is rel(X) where x is a number REPRESENTING the relative SIZE.

Discussion

48.	______ generate aesthetic mappings from a string.(a) aes_all(b) aes_auto(c) aes_string(d) aes_positionI had been asked this question in an interview for internship.My question is based upon ggplot2 topic in division Profiling, Simulation and Data Analysis of R Programming
Answer» The correct answer is (c) aes_string The BEST I can EXPLAIN: Aesthetic MAPPINGS describe how VARIABLES in the DATA are mapped to visual properties (aesthetics) of geoms.

Discussion

49.	Point out the correct statement?(a) update_element update contents of a theme(b) Use theme_update_element to modify a small number of elements of the current theme or use theme_set to completely override it(c) theme_bw is theme with grey background and white gridlines(d) is.rel reports whether x is a theme objectI had been asked this question in examination.My doubt is from ggplot2 in section Profiling, Simulation and Data Analysis of R Programming
Answer» Right option is (a) update_element update contents of a theme To explain: update_element FUNCTION is deprecated. Use %+REPLACE% or +.GG INSTEAD.

Discussion

50.	Which of the following is discrete state calculator?(a) discrete_scale(b) ggpcp(c) ggfluctuation(d) ggmissingThis question was addressed to me at a job interview.My question comes from ggplot2 in portion Profiling, Simulation and Data Analysis of R Programming
Answer» CORRECT choice is (c) ggfluctuation For explanation I would say: ggpcp is used to create a PARALLEL COORDINATE PLOT.

Discussion

Explore topic-wise InterviewSolutions in .

____________ produces one-dimensional scatterplots.(a) xyplot(b) stripplot(c) barchart(d) bwplotThis question was addressed to me in semester exam.This intriguing question originated from Exploratory Data Analysis topic in chapter Profiling, Simulation and Data Analysis of R Programming

_________ describe the type of plot you will produce.(a) geoms(b) ggplot(c) fplot(d) gplotThis question was posed to me during an interview.Origin of the question is ggplot2 topic in division Profiling, Simulation and Data Analysis of R Programming

_________ extract a subset of rows from a data frame based on logical conditions.(a) rename(b) filter(c) set(d) subsetThis question was addressed to me in exam.Question is taken from Data Wrangling in division Profiling, Simulation and Data Analysis of R Programming

Which of the following d takes two columns and spreads them into multiple columns?(a) ggmissplot(b) printplot(c) print.ggplot(d) ggplotI have been asked this question in final exam.My doubt stems from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming

Logical flag is applicable to which of the following plots?(a) scatterplot(b) dotplot(c) xyplot(d) zyplotThe question was asked during an online exam.I need to ask this question from Exploratory Data Analysis topic in chapter Profiling, Simulation and Data Analysis of R Programming

___________ is used to determine what is plotted for each group.(a) panel.expose(b) panel.impose(c) panel.superpose(d) panel.deposeI got this question in quiz.This intriguing question comes from Exploratory Data Analysis topic in division Profiling, Simulation and Data Analysis of R Programming

Which of the following draws nothing?(a) geom_blank(b) geom(c) geom_bin2d(d) geom_contourI had been asked this question in unit test.I would like to ask this question from ggplot2 in portion Profiling, Simulation and Data Analysis of R Programming

__________ is used when you have variables that form rows instead of columns.(a) tidy()(b) spread()(c) separate()(d) gather()I got this question at a job interview.My doubt stems from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming

________ add new variables/columns or transform existing variables.(a) mutate(b) add(c) apped(d) arrangeThis question was addressed to me in an online interview.The question is from Data Wrangling topic in chapter Profiling, Simulation and Data Analysis of R Programming

Which of the following is an example of a vector graphics device in R?(a) JPEG(b) PNG(c) GIF(d) SVGI had been asked this question during a job interview.I want to ask this question from Exploratory Data Analysis in section Profiling, Simulation and Data Analysis of R Programming

__________ produces box-and-whisker plots.(a) xyplot(b) dotplot(c) barchart(d) bwplotThe question was asked in an interview.Enquiry is from Exploratory Data Analysis in division Profiling, Simulation and Data Analysis of R Programming

Spread function is known as ___________ in spreadsheets.(a) pivot(b) unpivot(c) cast(d) orderI have been asked this question in final exam.I need to ask this question from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming

Which of the following function takes multiple columns?(a) spread()(b) gather()(c) separate()(d) extract()The question was asked in an online quiz.My question is taken from Data Wrangling in division Profiling, Simulation and Data Analysis of R Programming

How many functions exist for tidying the data?(a) one(b) two(c) three(d) fourThis question was posed to me in an international level competition.I want to ask this question from Data Wrangling topic in chapter Profiling, Simulation and Data Analysis of R Programming

Which of the following is complementary to tidyr?(a) geolr(b) dplyr(c) d3lr(d) gekl2The question was asked in an interview for job.This interesting question is from Data Wrangling topic in portion Profiling, Simulation and Data Analysis of R Programming

Which of the following merges two variables into one?(a) spread()(b) gather()(c) separate()(d) unite()This question was addressed to me in my homework.My doubt stems from Data Wrangling in section Profiling, Simulation and Data Analysis of R Programming

How many functions exist for wrangling the data with dplyr package?(a) one(b) seven(c) three(d) fiveThe question was posed to me in an online quiz.My query is from Data Wrangling topic in section Profiling, Simulation and Data Analysis of R Programming

Which function opens the screen graphics device for the Mac?(a) bitmap()(b) quartz()(c) pdf()(d) png()The question was asked during an interview.This key question is from Exploratory Data Analysis in division Profiling, Simulation and Data Analysis of R Programming

Which of the following create a set of identity mappings?(a) ggplot(b) aes_all(c) aes(d) ggorderI have been asked this question in an interview for internship.My question is from ggplot2 in portion Profiling, Simulation and Data Analysis of R Programming

_________is new package that makes it easy to “tidy” your data.(a) tidy(b) tidyr(c) tidyneat(d) tidynrThis question was addressed to me in unit test.This question is from Data Wrangling topic in section Profiling, Simulation and Data Analysis of R Programming

______ display a smooth density estimate.(a) geom_density2(b) geom_density(c) aes_sdensity(d) geom_contourI had been asked this question in exam.My question is taken from ggplot2 in chapter Profiling, Simulation and Data Analysis of R Programming

Which of the following is a plot to investigate the order in which observations were recorded?(a) ggplot(b) ggsave(c) ggpcp(d) ggorderThe question was posed to me in an interview.I'd like to ask this question from ggplot2 in division Profiling, Simulation and Data Analysis of R Programming

________ is used for relative sizing of theme elements.(a) rel(b) size(c) relative(d) timrintervalThis question was addressed to me in an online quiz.Query is from ggplot2 topic in division Profiling, Simulation and Data Analysis of R Programming

______ generate aesthetic mappings from a string.(a) aes_all(b) aes_auto(c) aes_string(d) aes_positionI had been asked this question in an interview for internship.My question is based upon ggplot2 topic in division Profiling, Simulation and Data Analysis of R Programming

Which of the following is discrete state calculator?(a) discrete_scale(b) ggpcp(c) ggfluctuation(d) ggmissingThis question was addressed to me at a job interview.My question comes from ggplot2 in portion Profiling, Simulation and Data Analysis of R Programming