Hi everyone,
I’m currently fitting on Mark software a Multi-state Jolly Seber (MSJS) model to live recapture data from an open population of immature green turtles. These turtles recruit on juvenile foraging ground after a short phase offshore. Then, they grow up until reach the sexual maturity, and leave for adult foraging ground. I used 6 states, 2 sites and 3 size classes on each site.
MSJS is of interest because it provides informations on the recruitment in the studied population through pent and pi.
Pent(i) meaning is clear, as this is the probability that an individual from the super-population move to given state i.
My problem is the meaning of pi. The Mark help give this definition: “pi -- probability of recruitment to each state”. But on the other way, we’ve already got this information using pent: {pent(i) x N* = number of new individuals in N(i)} where N* is the super-pop size and N(i) is the abundance of a certain state i. Thus, there is something I don’t get.
In Dupuis and Schwarz (2007), they didn’t mentioned pi in MSJS parameters. In the Mark book, MSJS is briefly mentioned in chapter 12 "Jolly Seber models in MARK" part 6 “Final words” but without information on pi.
Does anyone know how to interpret this pi ?
Thank you for your help.
Pierre
Dupuis, J. A., & Schwarz, C. J. (2007). A Bayesian Approach to the Multistate Jolly-Seber Capture-Recapture Model. Biometrics, 63(4), 1015–1022. http://www.jstor.org/stable/4541454