g0 Occasion Specific Estimates

[mjgould]

Hey Everyone,

I seem to be having a bit of a mind cramp. I'm trying to the pull occasion specific estimates of g0 from my model, but I'm struggling to do so. I'm not too experienced with the intricacies of calling upon specific parts of a fitted model so I may not even be in the right ballpark. I tried copying and tweaking code from previous posts but no luck.

The model is (t + veg) with 4 sampling occasions. I'd like g0 estimates for the each occasion but not each veg type. Any help would be much appreciated.

M

Here's my code:

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Sangres2013 <- secr.fit(...model = list(D ~ 1, g0 ~ t+veg, sigma ~ 1)
predict(Sangres2013, newdata = expand.grid(t = factor(1:4)))

[murray.efford]

M
I guess you have solved this by now... I do not know enough about 'veg' to be sure, but something like this should work:

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predict(Sangres2013, newdata = data.frame (t = factor(1:4), veg = rep(1,4)))

The point is that even though you do not want to vary 'veg', you must nominate a level that will be used by predict; g0 values will be specific to each t and that reference level of veg.
Murray

[mjgould]

Thanks once again for your time and clarifying the issue, Murray.