This function creates data frames, tightly coupled collections of
variables which share many of the properties of matrices and of
lists, used as the fundamental data structure by most of R's
modeling software. It is a keystroke saving wrapper for the data.frame function.
The only difference is that check.names and stringsAsFactors are FALSE by default.
NULL or a single integer or character string
specifying a column to be used as row names, or a character
or integer vector giving the row names for the data frame.
check.rows
if TRUE then the rows are checked for consistency of
length and names.
check.names
logical. If TRUE then the names of the variables in
the data frame are checked to ensure that they are
syntactically valid variable names and are not duplicated.
If necessary they are adjusted (by make.names) so that
they are.
stringsAsFactors
logical: should character vectors be converted to
factors?