Odds ratios by stratum in Proc freq

[Jaime2]

I'm doing differential item functioning (DIF) analyses using the CMH in Proc Freq and based on the breslow-day test of

Homogeneity of the Odds Ratios, there appears to be some nonuniform DIF. My question is whether I can use a keyword to request that the odds ratios be saved/printed for each of my 10 strata.  

I've looked on the SAS 9.3 documentation for this proc and can't find any related information. 

I'm using SAS 9.4

[ballardw]

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@Jaime2 wrote:

I'm doing differential item functioning (DIF) analyses using the CMH in Proc Freq and based on the breslow-day test of

Homogeneity of the Odds Ratios, there appears to be some nonuniform DIF. My question is whether I can use a keyword to request that the odds ratios be saved/printed for each of my 10 strata.  

I've looked on the SAS 9.3 documentation for this proc and can't find any related information. 

I'm using SAS 9.4

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It would help to show the code you are currently running. Some of the options to create output data sets, which is how I interpret "saved" require knowing which options were used to create the output. The OUTPUT statement may suffice or likely ODS OUTPUT.

[Jaime2]

Hi, Thanks for your reply - 'CMH' is the only option I have in the tables statement. I don't see any odds ratios for the individual strata, only the general odds ratio. 

proc freq data =mydata;

tables stratum*mode*item&i./ CMH ;

[Reeza]

Here's some instructions and explanations on how to capture output that is shown.
https://blogs.sas.com/content/sastraining/2017/03/31/capturing-output-from-any-procedure-with-an-ods...

If the output is shown you can capture it with the method above.

[Jaime2]

Thank you for this link! My problem is the OR is not there to begin with

[Reeza]

I think odds ratio are only done for 2x2 tables. You may need to use PROC LOGISTIC to get the odds ratio.

[Watts · Accepted solution]

For stratified 2x2 tables, the CMH provides the overall odds ratios and the Breslow-Day test. The OR option displays the stratum-level odds ratios. 

[Jaime2]

Thanks so much. For some reason I was stuck on trying to get the MH odds ratio for each stratum - but this works.