Displaying 1 result from an estimated 1 matches for "_logistic_regression".
2013 Jan 24
4
Difference between R and SAS in Corcordance index in ordinal logistic regression
...es and
> intercept with opposite signs, which is normal since R models the
> probabilities P(Y>=k|X) whereas SAS models the probabilities P(Y<=k|X)
> (see pdf attached, page 2 , table "Association des probabilit?s pr?dites
> et des r?ponses observ?es").
> SAS_Report_-_Logistic_Regression.pdf
> <http://r.789695.n4.nabble.com/file/n4656409/SAS_Report_-_Logistic_Regression.pdf>
>
> I chose the order for levels.
>
> I controlled that the corresponding probabilities P(Y=k|X) are the same
> with both softwares. But I can't understand why in SAS the C inde...