Description Usage Arguments Examples
build cross table from formula
| 1 | 
| data | 
 | 
| x | A formula specifying  | 
| layer | A third variable which is used to construct a three-dimensional crosstab. Strictly speaking there is no dependent or independet variable in
cross-tabulation. Nevertheless it is common to calculate percentages, for
which the distinction between dependent and independent variable is
meaningful.  | 
| 1 2 | 
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