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cff-version: 1.2.0
message: 'To cite package "SPAS" in publications use:'
type: software
license: GPL-2.0-or-later
title: 'SPAS: Stratified-Petersen Analysis System'
version: 2025.2.1
doi: 10.32614/CRAN.package.SPAS
abstract: 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://doi.org/10.2307/2332748>.
  When s<t, SPAS implements the methods described in Plante, Rivest, and Tremblay
  (1988) <https://doi.org/10.2307/2533994>. Schwarz and Taylor (1998) <https://doi.org/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.
authors:
- family-names: Schwarz
  given-names: Carl James
  email: cschwarz.stat.sfu.ca@gmail.com
repository: https://CRAN.R-project.org/package=SPAS
date-released: '2025-02-01'
contact:
- family-names: Schwarz
  given-names: Carl James
  email: cschwarz.stat.sfu.ca@gmail.com