The dataframe concept.
Donаld L. J. Quicke, Buntika A. Butcher, Rachel Kruft Welton · CABI eBooks · 2021
Abstract R objects come in a variety of types: dataframes, matrices, vectors, and arrays for example. Dataframes are an important concept in R, allowing vectors of different types to be combined column-wise into a single object. This chapter discusses combining sets of tables for data collected on different dates and converting factors in a dataframe to numeric or character.