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Time and Age Matrix
A parameter matrix that has parameters specific to both occasions and age is shown below:
1 7 8 9 10
2 8 9 10
3 9 10
4 10
5
Parameters 1 through 5 are the time-specific parameters for the first age class, e.g., young. That is, parameter 1 is the survival for young on the first occasion, parameter 2 is the survival for young on the second occasion, etc. Parameters 6 through 9 are the time-specific parameters for the next age class, say adults. Thus, parameter 7 is the survival of adults on occasion 2, parameter 8 is the survival of adults on occasion 3, etc. This example assumes that only young animals were marked.
So what happened to parameter 6? To estimate adult survival on the first occasion, adults would have to be marked on this occasion. The following matrix would represent adults that were marked at the same time as the juveniles in the above matrix.
6 7 8 9 10
7 8 9 10
8 9 10
9 10
10
This matrix is just a time-specific matrix for animals captured as adults.
The following matrix would represent 2 age classes (juveniles, subadults, and adults), where all the animals in the group are banded as young.
1 6 10 11 12
2 7 11 12
3 8 12
4 9
5
Parameters 1 through 5 represent juveniles for occasions 1 through 5, parameters 6 through 9 represent subadult survival for occasions 2 through 5, and parameters 10 through 12 represent adult survival for occasions 3 through 5. No parameters are estimated for subadults in occasion 1, nor adults in occasions 1 and 2.
See Time Parameter Matrices for how differentparameters are used for each occasion, and Age Matrix for parameters that are age-specific.
The quickest way to create a time- and age-specific matrix is to right-click the parameter block on the PIM Chart.