|
I used SAS PROC LOGISTIC to run Rasch Model.
Question:
Why do I get this error message? I did remove person and items whose responses are too perfect (All correct or all
wrong).
WARNING:
There is possibly a quasi-complete separation of data points. The maximum likelihood
estimate may not exist.
WARNING: The LOGISTIC procedure continues in spite of the above warning.
Results shown are based on the last maximum likelihood iteration.
Validity of the model fit is questionable.
|
