topic Re: Proc Logistic ( NOTE At least one element of the (projected) gradient is greater than 1e-3) in Statistical Procedures

Proc Logistic ( NOTE At least one element of the (projected) gradient is greater than 1e-3)

VioletaB — Wed, 26 Feb 2025 15:31:05 GMT

Hello,

I am trying to run the following code:

proc logistic data=l;
class trt(ref="0") group GR1 GR1/ param=ref;
model crit(event="1")= trt group BASE GR1 GR1 / alpha=0.05 expb plcl plrl lackfit orpvalue;
Run;

base is continuous variable, all others are binary. I get the following NOTE: At least one element of the (projected) gradient is greater than 1e-3 and it looks that this is due to calculating p-value. if orpvalue removed from the model statement, this note is not present anymore. Is there any other way to calculate p-value for Odds Ratio with proc logistic or example of how to do this with proc glimmix or genmode?

Thank you

Re: Proc Logistic ( NOTE At least one element of the (projected) gradient is greater than 1e-3)

sbxkoenk — Wed, 26 Feb 2025 15:37:54 GMT

There are some alternative ways in
... SAS Note 53376: "Computing p-values for odds ratios."

Usage Note 53376: Computing p-values for odds ratios

https://support.sas.com/kb/53/376.html

Ciao, Koen

Re: Proc Logistic ( NOTE At least one element of the (projected) gradient is greater than 1e-3)

Ksharp — Thu, 27 Feb 2025 02:12:48 GMT

Not sure. But deserve to try option FIRTH:

model crit(event="1")= trt group BASE GR1 GR1 / firth ;