Link Functions

Release-Recapture	Known-Fate

The functional relationship of the model parameters to the SURPH survival probabilities is defined by the link function. SURPH.2 defines three link functions.

• The identity link assumes an additive effect on survival probability. The identity link is the default link for all SUR PH probabilities.
• The hazard link assumes a multiplicative effect on hazard rate, an exponential effect on survival probability.
• The logit link assumes an additive effect on log odds ratio.

Both the hazard link and the logit link constrict the probabilities to be between 0 and 1; the identity link allows a probability to be greater than 1.

For release-recapture data, the same link functions are also available for modeling the detecton probabilities and the joint product term in the last period. Link functions are specified separately for the survival, detection and joint product terms.

Continue with Link Function Details.

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