Psi as random intercept

questions concerning analysis/theory using program PRESENCE

Psi as random intercept

Postby jhubbell072786 » Mon Dec 07, 2020 4:49 pm

Quick question...

As the topic title suggests, I'd like to model psi as a random intercept using a categorical factor. Is this possible in PRESENCE? I think this would not be possible. I know it is going the BUGs route...

Thanks,

Josh
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Re: Psi as random intercept

Postby jhines » Tue Dec 08, 2020 12:00 am

Hi Josh,

If you're referring to individual random effects (eg., logit(psi) = B0 + B1*group2 + B2*group3 + .. + sigma), then, no it's not currently possible in PRESENCE. You'll need BUGS for that. If you just mean a different psi for each group (logit(psi) = B0 + B1*group2 + B2*group3 + ... B(n-1)*group(n)), then yes, you just have a group-indicator covariate and model psi as a function of the group-indicator covariates.
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Re: Psi as random intercept

Postby cooch » Tue Dec 08, 2020 9:53 am

Various random effects models for occupancy are available in MARK. As per Jim's comment, whether or not that might be an option depends on what you mean by 'random effect'.
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