Hello,
I am trying to include effort as a covariate to model capture probability (g0). However, due to high variability in effort across detectors (range: 11 m to 7500 m), I am encountering the following warning message:
Extreme 'beta' in 'fastsecrloglikfn' (try smaller stepmax in nlm Newton-Raphson?)
As a result, my density estimates appear to be unreliable. However, when I exclude effort from the model, the results seem reasonable.
My study includes 289 detectors, with detections recorded at 92 of them. I would like to incorporate effort as a covariate while ensuring stable model performance. Could you suggest the best approach to handle this issue?
Thank you