Hi, I'm having a little trouble interpreting the square PIMS output of the POPAN model, and just want to confirm I am interpreting it correctly.

I have animals categorized into year first sighted (cohort), and I am using a phi=~ time+cohort+sex model.

The output of the real parameters shows phi values for the animals before they first entered the population. Do I just ignore this and read it as if it were a triangular PIMS?

Here is the example PIMS. a= cohort first seen in 2001, b= first seen 2002, c=first seen 2003, d=first seen 2004.

2001 2002 2003 2004

a 1 2 3 4

b 5 6 7 8

c 9 10 11 12

d 13 14 15 16

I know the phi value for group c (first seen in 2003) doesn't make sense (alongside the other numbers in red) as in 2001/2 they were not in the population.

Am I correct to just be using the following values (taking the phi value from when the group first entered the population?

2001 2002 2003 2004

a 1 2 3 4

b 6 7 8

c 11 12

d 16

Many thanks,

Tom