InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the use of "next" statement in R? |
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| 2. |
How to obtain the transpose of a matrix in R? |
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| 3. |
What is the output for the below expression all(NA==NA)? |
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| 4. |
How do you check if "m" is a matrix data object in R? |
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| 5. |
What is the difference between subset() function and sample() function in R? |
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| 6. |
Give the syntax for creating scatterplot matrices. |
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| 7. |
Give the command to check if the element 15 is present in vector x. |
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| 8. |
What is the use of the command - install.packages(file.choose(), repos=NULL)? |
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| 9. |
List the data sets available in all available packages. |
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| 10. |
List the data sets available in package "MASS" |
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| 11. |
How do you remove a vector from the R workspace? |
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| 12. |
Give the command to create a histogram. |
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| 13. |
What does col.max(x) do? |
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| 14. |
What is the difference between "%%" and "%/%"? |
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| 15. |
How do you set the path for current working directory in R? |
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| 16. |
How do you get the standard deviation for a vector x? |
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| 17. |
How to find the help page on missing values? |
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| 18. |
Is an array a matrix or a matrix an array? |
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| 19. |
What is the use of apply() in R? |
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| 20. |
Give a function in R that replaces all missing values of a vector x with the sum of elements of that vector? |
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| 21. |
How do you convert the data in a JSON file to a data frame? |
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| 22. |
X is the vector c(5,9.2,3,8.51,NA), What is the output of mean(x)? |
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| 23. |
Give the R expression to get 26 or less heads from a 51 tosses of a coin using pbinom. |
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| 24. |
What does unlist() do? |
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| 25. |
Vector v is c(1,2,3,4) and list x is list(5:8), what is the output of v*x[[1]]? |
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| 26. |
Vector v is c(1,2,3,4) and list x is list(5:8), what is the output of v*x[1]? |
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| 27. |
Give a R script to extract all the unique words in uppercase from the string - "The quick brown fox jumps over the lazy dog". |
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| 28. |
What is expected from running the command - strsplit(x,"e")? |
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| 29. |
How to get a list of all the packages installed in R ? |
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| 30. |
What is the output of runif(4)? |
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| 31. |
What is reshaping of data in R? |
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| 32. |
In doing time series analysis, what does frequency = 6 means in the ts() function? |
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| 33. |
which function is used to create a boxplot graph in R? |
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| 34. |
Give the general expression to create a matrix in R. |
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| 35. |
Can we update and delete any of the elements in a list? |
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| 36. |
Name a R packages which is used to read XML files. |
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| 37. |
How do you install a package in R? |
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| 38. |
What is lazy function evaluation in R? |
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| 39. |
What are different ways to call a function in R? |
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| 40. |
What is recycling of elements in a vector? Give an example. |
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| 41. |
How do you access the element in the 2nd column and 4th row of a matrix named M? |
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| 42. |
How R is used in logistic regression? |
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| 43. |
What is R Base package? |
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| 44. |
How do you get the name of the current working directory in R? |
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| 45. |
How can you load and use csv file in R? |
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| 46. |
Which data object in R is used to store and process categorical data? |
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| 47. |
What is the main difference between an Array and a matrix? |
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| 48. |
What makes a valid variable name in R? |
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| 49. |
What are the different data objects in R? |
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| 50. |
What is R Programming? |
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