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The Stratified-Petersen Analysis System (SPAS) is designed
to estimate abundance in two-sample capture-recapture experiments
where the capture and recaptures are stratified. This is a generalization
of the simple Lincoln-Petersen estimator.
Strata may be defined in time or in space or both,
and the s strata in which marking takes place
may differ from the t strata in which recoveries take place.
When s=t, SPAS reduces to the method described by
Darroch (1961) <doi:10.2307/2332748>.
When s<t, SPAS implements the methods described in
Plante, Rivest, and Tremblay (1988) <doi:10.2307/2533994>.
Schwarz and Taylor (1998) <doi:10.1139/f97-238> describe
the use of SPAS in estimating return of salmon stratified by
time and geography.
A related package, BTSPAS, deals with temporal stratification where
a spline is used to model the distribution of the population
over time as it passes the second capture location.
This is the R-version of the (now obsolete) standalone Windows
program of the same name.

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