Figure out margining variables.
Given the variables that form the rows and columns, and a set of desired margins, works out which ones are possible. Variables that can't be margined over are dropped silently.
margins(vars, margins = NULL)
vars |
a list of character vectors giving the variables in each dimension |
margins |
a character vector of variable names to compute margins for.
|
list of margining combinations, or NULL if none. These are
the combinations of variables that should have their values set to
(all)
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