Helper function for
dtable. Returns information about each
variable's class, mode, type, and number of response levels in a
as.list = TRUE.
specify one or more variable names with a character vector
Returns a data.frame or list with the variable names and their respective classes. Returns a data.frame by default.
class to examine method for extracting class.
mode to examine method for extracting mode.
typeof to examine method for extracting type.
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