SPAS

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 of the same name.

Downloads

CRAN Check Status

  installed size is 47.7Mb
  sub-directories of 1Mb or more:
    libs  46.9Mb

  installed size is 47.0Mb
  sub-directories of 1Mb or more:
    libs  46.3Mb

  installed size is 13.4Mb
  sub-directories of 1Mb or more:
    libs  12.6Mb

Check History

  installed size is 47.7Mb
  sub-directories of 1Mb or more:
    libs  46.9Mb

  installed size is 47.0Mb
  sub-directories of 1Mb or more:
    libs  46.3Mb

  installed size is 13.4Mb
  sub-directories of 1Mb or more:
    libs  12.6Mb

Reverse Dependencies (1)

Dependency Network

Version History