Get or set stat types of columns on a data frame
a column in a data frame
a single-element character vector
In EDP, columns in a population have "stat types." Numeric columns are
usually "realAdditive" and "realMultiplicative". Factors are usually
"categorical." These functions get and set the stat type on a data frame you
will build a population from; you can also get the stat type of a column from
a single-element character vector,
NA if no stat type was set
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