Why's there so many NA-value?

[N0ogle]

[Jeffrey Royle]

without additional information its hard to say what's going on here.  But the model is far too complex as a starting point for analysis. You should first start with a simple model with only 1 covariate or so and make sure the model produces decent results. Use those estimates as starting values in the next model and so on, and this sometimes avoids non-convergence and numerical instability which may be the problem here.

How big is the data set (# sites? # replicates?)  Low sample sizes is often a problem.

You may have an identifiability issue or complete/partial separability. FAQ What is complete or quasi-complete separation in logistic regression and what are some strategies to deal with the issue? (ucla.edu)

regards

andy

On Wed, Aug 28, 2024 at 6:27 AM N0ogle <wjy...@gmail.com> wrote:

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