tlyons4 wrote:I thought my ahy S had been set the same for marking groups (1) and parameter 2 is the survival for the first period for inviduals marked as HY. 3 and 4 refer to the recovery parameters for the different age classes.
So I see it is -- I misread it the first time, because of the way it was formatted (or rather, not formatted) in the post.
No matter. if you have the 'adults' share the parameter across marking groups, then you're fine (which is what Gary and Paul were noting). My response was based on my '(erroneous) assumption that you wanted a separate parameter for HY adults and for AHY adults (which is how I originally interpreted 'includes a difference between HY birds').
Now, if you have a separate parameter for HY and AHY adults (i.e., if you don't assume that all adults are the same), then you have problems with dead recovery data, but not live encounter data. The usual question is (I remember David Anderson asking me this) is 'why would you have a different parameter for HY individuals as adults, and AHY adults? Simple. In many situations, you have no way of knowing anything about adults marked AHY. You simply know they're 'adults'. While adults from HY tagged individuals are necessarily 'born there', adults from AHY markings represent (or, can) an unknown mixture of individuals from different locations, which might influence their survival. If your marking occurs at migration stopover locations, this is often a fairly big deal, as it turns out. So, you might think to address this by having one parameter for 'born there' adults (from HY marked individuals), and one parameter for 'not sure where they're from' adults (from AHY markings). Alas, as noted, this doesn't work.