Programming the statistical procedures from SAS

Logistic regression concordant percentage

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New Contributor
Posts: 3

Logistic regression concordant percentage

Hi,

I'm sas new user. I wonder if it's possible to get a 100% concordant percentage and D de Somers value=1 with a logistic regression. It seems so perfect to me!

Thanks

Grand Advisor
Posts: 16,933

Re: Logistic regression concordant percentage

Only if your data has perfect separation. Usually this happens when you accidentally include a variable that's observed with the outcome, sometimes after the fact. 

 

I wouldn't trust the model and would be verifying it thoroughly. 

 

PS I'm going to move this to the stats forums as it relates more to statistics. 

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