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Thread: multiple roc predicted probability to find cut off value of combining variables

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    Find cut off value of combining variables when combining roc curves

    I have 2 continuous variables for which I have roc curves for an outcome. Now I used binary logistic and predicted probability to get a combined roc with higher area under curve. But the cut off value in terms of the initial 2 variables?. Predicted probability more than 0.032 doesn't mean anything practically . I need to say that if variable a is more than x and variable b is more than y then together it has 90 per cent sensitivity in predicting outcome. How do I get this value of the 2 variables from the new cut off predicted probability I got from binary logistic regression in spss? Kindly help
    Last edited by jm_manipadam; 03-20-2017 at 05:51 AM.

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