Calculate summary statistics from quant. variables and retur a data.frame.
1 2  | 
df | 
 An object of class   | 
groups | 
 A char vector of var names (used for grouping)  | 
vars | 
 A char vector of var names  | 
logic | 
 If   | 
stats | 
 A char vector of function names  | 
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