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______ let’s you perform SQL queries on your R data frames.

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______ let’s you perform SQL queries on your R data frames. (a) sqldf (b) plyr (c) forecast (d) daply I had been asked this question in an online interview. I'd like to ask this question from Packages in chapter Commands, Packages, Visualizing Data and Linear Regression of R Programming Select the correct answer from above options

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Right choice is (b) plyr To elaborate: sqldf uses SQLite syntax. Plyr will split-apply-combine paradigm for R. Forecast is a generic function for forecasting from time series or time series models. The function invokes particular methods which depend on the class of the first argument.

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