Programming the statistical procedures from SAS

PROC SURVEYLOGISTIC - SAS 9.3 vs. SAS 9.4

Reply
Learner
Posts: 1

PROC SURVEYLOGISTIC - SAS 9.3 vs. SAS 9.4

Hi everyone,

 

I wonder why the confidence intervals (variance estimates) are slightly different when I run the exact same proc surveylogistic syntax using SAS 9.4 and SAS 9.3.  For example:

 

proc surveylogistic data= abc varmethod= BRR;
weight WGT_FULL;
repweights bsw1-bsw500 / df =24;
class sex (ref= '1') / param = ref;
model SLP=sex;
run;

 

The confidence intervals are slightly wider when I used SAS 9.4.  Are there any differences between the two versions for this procedure?? I can't seem to find the information anywhere else.

 

Thanks!

Grand Advisor
Posts: 10,043

Re: PROC SURVEYLOGISTIC - SAS 9.3 vs. SAS 9.4

The most likely reason would be the refinement of algorithms in the coding of procedures between releases.

 

Secondary posibilities are a change from a 32-bit to 64-bit implementation.

Grand Advisor
Posts: 16,874

Re: PROC SURVEYLOGISTIC - SAS 9.3 vs. SAS 9.4

I would contact SAS Support with this, if you have concerns. It also depends on the differences, if their less than 0.0001 it's most likely precision issues more than anything else. 

Ask a Question
Discussion stats
  • 2 replies
  • 168 views
  • 0 likes
  • 3 in conversation