Hi list,I'm performing qdec. This my file.dat1  diagnosis  discrete 2    1  
Pathology    2  Controls2  Thickness_lh  continuous 03  Thickness_rh  
continuous 04  NPStest  continuous 0                Continuous Factors:         
Mean:       StdDev:                -------------------         -----       
-------                       Thickness_lh         2.643         0.116          
             Thickness_rh         2.630         0.099                           
   NPStest         0.774         1.203Number of subjects:   31Number of 
factors:    4 (1 discrete, 3 continuous)Number of classes:    2Number of 
regressors: 8NPStest is scored from 0 to 8 and for controls it is all 
0.Previously I have performed qdec without problem but I'm noting that when I 
use covariates that contains all 0 in a group, qdec give me an error. What's 
happen?Thanks,

Stefano  
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