Hi list,
I'm performing qdec. This my file.dat
1  diagnosis  discrete 2
    1  Pathology
    2  Controls
2  Thickness_lh  continuous 0
3  Thickness_rh  continuous 0
4  NPStest  continuous 0
                Continuous Factors:         Mean:       StdDev:
                -------------------         -----       -------
                       Thickness_lh         2.643         0.116
                       Thickness_rh         2.630         0.099
                              NPStest         0.774         1.203
Number of subjects:   31
Number of factors:    4 (1 discrete, 3 continuous)
Number of classes:    2
Number of regressors: 8
NPStest 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