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.
| Version: | 2025.2.1 |
| Imports: | checkmate, MASS, Matrix, msm, numDeriv, plyr, reshape2, TMB (≥ 1.7.15), utils |
| LinkingTo: | TMB, RcppEigen |
| Suggests: | knitr, rmarkdown |
| Published: | 2025-02-06 |
| DOI: | 10.32614/CRAN.package.SPAS |
| Author: | Carl James Schwarz [aut, cre] |
| Maintainer: | Carl James Schwarz <cschwarz.stat.sfu.ca at gmail.com> |
| License: | GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| NeedsCompilation: | yes |
| Materials: | README, NEWS |
| CRAN checks: | SPAS results |
| Reference manual: | SPAS.html , SPAS.pdf |
| Vignettes: |
Automatic Pooling (source, R code) Conne River 1991 Data (source, R code) Conne River 1992 Data (source, R code) Harrison River Female Chinook 2011 Data (source, R code) Pooling Columns (source, R code) Testing for Pooled Petersen (source, R code) Things that can go wrong (source, R code) |
| Package source: | SPAS_2025.2.1.tar.gz |
| Windows binaries: | r-devel: SPAS_2025.2.1.zip, r-release: SPAS_2025.2.1.zip, r-oldrel: SPAS_2025.2.1.zip |
| macOS binaries: | r-release (arm64): SPAS_2025.2.1.tgz, r-oldrel (arm64): SPAS_2025.2.1.tgz, r-release (x86_64): SPAS_2025.2.1.tgz, r-oldrel (x86_64): SPAS_2025.2.1.tgz |
| Old sources: | SPAS archive |
| Reverse imports: | Petersen |
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