Hi all,
I am quite a beginner in analyzing capture-mark-recapture data with E-Surge and U-care.
I build a multi-state CR model in E-Surge to study movement of a fish population between five areas. One of the particularities of the dataset is that a fish history only consists of one or two observations: at tagging and at recapture. In fact, recapture corresponds to dead fish caught by the fisheries, and fish cannot be observed alive between tagging and recapture.
A fish history is like:
0002000005 or 0000000100 or 05000300000 for a detection in areas 1 to 5.
There is a lot of fish that are not recaptured, making the dataset quite sparse.
I wanted to perform a GOF test as it is usually done in the literature. I used U-care and its GOF for multistate model, and it returns statistics equal to 0 or NaN.
So I decided to simplify my GOF test by using a single state model instead. When I do so, I have results for the 2.cl and 2.ct tests, but I am not able to compute the two tests 3.SR and 3.SM: U-care only returns zeroes.
I also try to remove the temporal effect by starting all fish histories with the tagging event without success.
I don’t think I have transient individuals in my dataset due to the species ecology and sampling design of the study, but I would like to test for an effect of newly marked versus previously marked individuals. Do you have any suggestions, which could help me in performing a GOF test ?
Many thanks,
Jean-Baptiste