Dataframes
Michael John Crawley · 2012
This chapter contains sections titled: Subscripts and indices Selecting rows from the dataframe at random Sorting dataframes Using logical conditions to select rows from the dataframe Omitting rows containing missing values, NA Using order and !duplicated to eliminate pseudoreplication Complex ordering with mixed directions A dataframe with row names instead of row numbers Creating a dataframe from another kind of object Eliminating duplicate rows from a dataframe Dates in dataframes Using the match function in dataframes Merging two dataframes Adding margins to a dataframe Summarizing the contents of dataframes