3 Data transformation

Learning objectives:

• Pick out rows of a data frame with the dplyr::filter() function.
• Sort rows of a data frame with dplyr::arrange().
• Pick out columns of a data frame with dplyr::select().
• Modify columns of a data frame with dplyr::mutate().
• Group rows of a data frame with dplyr::group().
• Apply functions to columns of a (grouped) data frame with dplyr::summarize().
• Streamline data transformations with the pipe operator (|>).