Hi all,
I've been working through how to determine the effect of a covariate on psi, however have only come across worked examples that use categorical covariates (e.g. browsed/unbrowsed for the Weta example and good/poor colony for the Swift example in MARK). I understand it thus far that to calculate an odds ratio, you are comparing relative successes and failures of two 'outcomes', but what if you have a continuous covariate, such as habitat patch size?
I am trying to figure out the 'effect' (if any) of patch size (standardised into a z score) in my data, but haven't grasped how to apply the odds ratio principle to this kind of data.
Any thoughts would be much appreciated.
Cheers, Penny.