BookmarkSubscribeRSS Feed
🔒 This topic is solved and locked. Need further help from the community? Please sign in and ask a new question.
pcc25
Calcite | Level 5

I performed a logistic regression with stepwise selection, and a variable that was retained has on OR point estimate of 1.000, with 95% Wald CLs of 1.000-1.001.  Is this likely a glitch, or are the "true" point estimate and lower CL just a titch above 1 and victims of rounding (e.g., lower CL 1.00001, point estimate 1.00008)?

 

The code:

PROC LOGISTIC DATA=train;

    CLASS landcover (REF='11') / PARAM=REF;

    MODEL case (EVENT='1')=landcover water_pct temperature precipitation / SELECTION=STEPWISE;

RUN;

 

1 ACCEPTED SOLUTION

Accepted Solutions
Rick_SAS
SAS Super FREQ

Because the variable was selected, I would guess the CI is [1 + epsilon, 1.001].  You can use the ODS OUTPUT statement to see the full precision of the estimates:

 

ods output OddsRatios=OR;

PROC LOGISTIC ...;
RUN;

proc print data=OR; 
format LowerCL UpperCL 16.14;
run;

View solution in original post

1 REPLY 1
Rick_SAS
SAS Super FREQ

Because the variable was selected, I would guess the CI is [1 + epsilon, 1.001].  You can use the ODS OUTPUT statement to see the full precision of the estimates:

 

ods output OddsRatios=OR;

PROC LOGISTIC ...;
RUN;

proc print data=OR; 
format LowerCL UpperCL 16.14;
run;

sas-innovate-2024.png

Available on demand!

Missed SAS Innovate Las Vegas? Watch all the action for free! View the keynotes, general sessions and 22 breakouts on demand.

 

Register now!

What is ANOVA?

ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.

Find more tutorials on the SAS Users YouTube channel.

Discussion stats
  • 1 reply
  • 1131 views
  • 0 likes
  • 2 in conversation