Hello all, I have a small problem with the look of my ROC curve. My dataset looks like this: company total assets city flag 1 32432 Boston 0 2 32213 New York 1 3 12341 Chicago 0 4 32124 Boston 0 . . . . . . . . . 23626 7563 Chicago 0 So, we have observations on 23626 companies, with financials (there are more then just total assets), city and a flag, which says 0 if the company is not bankrupt or 1 if the company is bankrupt. So, i'm fitting a logistic regression, like this: proc logistic data=have plots(only)=(roc(id=obs) effect); class city (ref='chicago') / param = ref; model flag(event='1') = TA EAToTA city; run; I get a curve like the one attached. Why does my curve look like that? I thought it should only be a line and not some sort of band? Does it have something to do with the number of observations which is 23626 ? Furtheremore i would like to know how to get 3 curves in the same graph. As if i have 3 datasets, like the one above, and then two others with the same companies, just from a different year. Thank you, yocrashi
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