convert SE for beta to SE for real estimate

questions concerning analysis/theory using program MARK

convert SE for beta to SE for real estimate

Postby dtempel » Wed Aug 28, 2019 11:51 am

I ran a survival analysis to estimate site-specific survival. We had two groups (male, female) and an individual categorical covariate for the site that an individual occupied. The model output gives an estimate and SE for each beta coefficient (which corresponds to a particular site), but I'd like to obtain SE's for the real parameter estimate at each site. What's the best way to do that?
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Re: convert SE for beta to SE for real estimate

Postby jlaake » Fri Aug 30, 2019 12:39 pm

Doesn't look like anyone answered your question. The easiest thing to do would be to use site as a grouping factor as well and then you would automatically get real estimates for each site with its se. But given that you used it as an individual covariate, then you can specify the value of the covariate you want to have MARK (assuming that is what you are using) use when it computes real parameters. You used to have to run a model with each covariate value but I think Gary changed this so you can specify a set of values to compute the real parameters without re-running. Look at the documentation and I'm sure you'll find it. I use RMark so not sure where it is.
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Re: convert SE for beta to SE for real estimate

Postby cooch » Fri Aug 30, 2019 1:03 pm

Using current GUI-based MARK, 'Run | Regenerate Real and Derived Estimates'.
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Re: convert SE for beta to SE for real estimate

Postby dtempel » Fri Aug 30, 2019 10:46 pm

Thanks everyone for your help. I ended up grouping by site and treating sex as the individual covariate, and I got the SE's that I needed.
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