Is there a way to highlight which obs are being omitted in clogit?

[Johnathan Athanasius]

Hello,

I am trying to run clogit and I get the following note: "1,268 groups (11,377 obs) omitted because of all positive or all negative outcomes."

Is there a way to highlight which observations/groups are being omitted?

Thank you

[Leonardo Guizzetti]

Yes there is.

gen byte used = e(sample)
browse if !used

Every estimation command sets special macro called e(sample) to identify in-sample observations. The opposite are naturally not used. I suspect you have lots of clusters with no within-cluster variation and so contribute nothing to the conditional model.

[Nick Cox]

Cross-posted and answered at https://www.reddit.com/r/stata/comme...obs_are_being/

Please note our policy on cross-posting, which is that you are asked to tell us about it.https://www.statalist.org/forums/help#crossposting

[Johnathan Athanasius]

Hello,
Thank you for the e(sample) suggestion! That worked perfectly.

For the cross-post, my apologizes. Will do so in the future!