Server-side function called by ds.meanSdGp
     
    
    
    Arguments
- X
 
a client-side supplied character string identifying the variable for which
means/SDs are to be calculated
 
- INDEX
 
a client-side supplied character string identifying the factor across
which means/SDs are to be calculated
 
 
    
    Value
    List with results from the group statistics
     
    
    Details
    Computes the mean and standard deviation across groups defined by one
factor