I have encountered an error while I was trying to obtain ROC curve in
logistic regression analysis in spss. could you please help me??
the error was this:
Either or both of the positive and negative actual state groups have no
valid observations. Estimation cannot be performed, and the ROC curve will
not be displayed.
Case Processing Summary
severity Valid N (listwise)
Larger values of the test result variable(s) indicate stronger evidence for
a positive actual state.
The positive actual state is 0.
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