Q. Which of the following return a subset of the columns of a data frame?

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Q. Point out the correct statement?

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Q. _________ extract a subset of rows from a dataframe based on logical conditions.

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Q. _________ generate summary statistics of different variables in the data frame, possibly within strata.

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Q. Point out the wrong statement?

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Q. ________ add new variables/columns or transform existing variables.

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Q. The _______ operator is used to connect multiple verb actions together into a pipeline.

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Q. The dplyr package can be installed from GitHub using the _______ package.

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Q. The dplyr package can be installed from CRAN using __________

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Q. Which of the following object is masked from ‘package: stats’?

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Q. The _________ function can be used to select columns of a data frame that you want to focus on.

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Q. Point out the correct statement?

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Q. ________ function is similar to the existing subset() function in R but is quite a bit faster.

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Q. Columns can be arranged in descending order too by using the special ____ operator.

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Q. Point out the wrong statement?

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Q. The _________ function is used to generate summary statistics from the data frame within strata defined by a variable.

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Q. The ______ operator allows you to string operations in a left-to-right fashion.

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Q. There is an SQL interface for relational databases via the _______ package.

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Q. dplyr can be integrated with the ________ package for large fast tables.

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Q. Which of the following function is similar to summarize?

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