InterviewSolution

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101.	Point out the correct statement.(a) findLinearColumns will also return a vector of column positions can be removed to eliminate the linear dependencies(b) findLinearCombos will return a list that enumerates dependencies(c) the function findLinearRows can be used to generate a complete set of row variables from one factor(d) none of the mentionedThis question was posed to me in an interview for job.Question is from caret in division Machine Learning of Data Science
Answer» Correct option is (b) findLinearCombos will return a list that ENUMERATES DEPENDENCIES To explain: For each linear combination, it will incrementally REMOVE columns from the matrix and test to SEE if the dependencies have been resolved.

102.	caret does not use the proxy package.(a) True(b) FalseI had been asked this question in final exam.My question comes from caret topic in section Machine Learning of Data Science
Answer» RIGHT choice is (b) False To explain: CARET uses the proxy package.

103.	Point out the wrong statement.(a) Simple random sampling of time series is probably the best way to resample times series data.(b) Three parameters are used for time series splitting(c) Horizon parameter is the number of consecutive values in test set sample(d) All of the mentionedI got this question in an online interview.This interesting question is from caret topic in portion Machine Learning of Data Science
Answer» The correct answer is (a) Simple RANDOM sampling of TIME series is probably the best WAY to resample TIMES series data. The explanation: Simple random sampling of time series is probably not the best way to resample times series data.

104.	Point out the wrong statement.(a) Model based approach may be computationally convenient(b) Model based approach use Bayes theorem(c) Model based approach are reasonably inaccurate on real problems(d) All of the mentionedI got this question during an online interview.Origin of the question is Model Based Prediction topic in division Machine Learning of Data Science
Answer» The correct CHOICE is (C) MODEL based approach are reasonably inaccurate on real PROBLEMS Explanation: Model based approach are reasonably accurate on real problems.

105.	Which of the following can be used to create sub–samples using a maximum dissimilarity approach?(a) minDissim(b) maxDissim(c) inmaxDissim(d) all of the mentionedI had been asked this question during an online interview.Question is taken from caret in portion Machine Learning of Data Science
Answer» The correct CHOICE is (B) maxDissim To explain I WOULD SAY: Splitting is based on the PREDICTORS.

106.	Point out the wrong statement.(a) In every situation, the data generating mechanism can create predictors that only have a single unique value(b) Predictors might have only a handful of unique values that occur with very low frequencies(c) The function findLinearCombos uses the QR decomposition of a matrix to enumerate sets of linear combinations(d) All of the mentionedThis question was posed to me in an interview.I need to ask this question from caret topic in portion Machine Learning of Data Science
Answer» The CORRECT OPTION is (a) In EVERY situation, the DATA generating mechanism can create predictors that only have a single unique value Explanation: In some situations, the data generating mechanism can create predictors that only have a single unique value.

107.	Which of the following can be used to generate balanced cross–validation groupings from a set of data?(a) createFolds(b) createSample(c) createResample(d) none of the mentionedThis question was posed to me during an interview for a job.The doubt is from caret topic in division Machine Learning of Data Science
Answer» Correct choice is (a) createFolds Easiest explanation - createResample can be USED to make SIMPLE bootstrap SAMPLES.

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