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) <https://www.jstor.org/stable/2332748>. When s<t, SPAS implements the methods described in Plante, Rivest, and Tremblay (1988) <https://www.jstor.org/stable/2533994>. Schwarz and Taylor (1998) <https://cdnsciencepub.com/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 available at <https://home.cs.umanitoba.ca/~popan/spas/spas_home.html>.
|Imports:||MASS, Matrix, msm, numDeriv, plyr, reshape2, TMB (≥ 1.7.15)|
|Author:||Carl James Schwarz|
|Maintainer:||Carl James Schwarz <cschwarz.stat.sfu.ca at gmail.com>|
|License:||GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]|
|CRAN checks:||SPAS results|
Conne River 1991 Data
Conne River 1992 Data
Harrison River Female Chinook 2011 Data
Testing for Pooled Petersen
Things that can go wrong
|Windows binaries:||r-devel: SPAS_2023.3.31.zip, r-release: SPAS_2023.3.31.zip, r-oldrel: SPAS_2023.3.31.zip|
|macOS binaries:||r-release (arm64): SPAS_2023.3.31.tgz, r-oldrel (arm64): SPAS_2023.3.31.tgz, r-release (x86_64): SPAS_2023.3.31.tgz, r-oldrel (x86_64): SPAS_2023.3.31.tgz|
|Old sources:||SPAS archive|
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