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SPAS
View on CRAN: Click
here
Download and install SPAS package within the R console
Install from CRAN:
install.packages("SPAS")
Install from Github:
library("remotes")
install_github("cran/SPAS") Install by package version:
library("remotes")
install_version("SPAS", "2025.2.1") Attach the package and use:
library("SPAS")
Maintained by
Carl James Schwarz
[Scholar Profile | Author Map]
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2019-02-18
Latest Update: 2025-02-06
Description:
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 available at <https://home.cs.umanitoba.ca/~popan/spas/spas_home.html>.
How to cite:
Carl James Schwarz (2019). SPAS: Stratified-Petersen Analysis System. R package version 2025.2.1, https://cran.r-project.org/web/packages/SPAS. Accessed 08 Oct. 2026.
Previous versions and publish date:
Other packages that cited SPAS R package
View SPAS citation profile
Other R packages that SPAS depends,
imports, suggests or enhances
Complete documentation for SPAS
Functions, R codes and Examples using
the SPAS R package
Some associated functions: SPAS.extract.par.est . SPAS.fit.model.legacy . SPAS.fit.model . SPAS.likelihood.star.DM . SPAS.print.model.legacy . SPAS.print.model . dot-onAttach . dummy . logit .
Some associated R codes: SPAS.extract.par.est.R . SPAS.fit.model.R . SPAS.fit.model.legacy.R . SPAS.log.likelihood.R . SPAS.print.model.R . SPAS.print.model.legacy.R . roxygentags.R . zzz.R . Full SPAS package functions and examples
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