An official website of the United States government
Here's how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Latest Earthquakes | Live WebChat Share Social Media
An official USGS software project is code reviewed and approved at the bureau-level for distribution.
Computes the number of animals that must be banded in order to achieve a specified level of precision for survival rates estimated using band recovery models.
Computes the power of between-model likelihood ratio tests.
Computes estimates of survival and temporary emigration under the "Open Robust Design".
Computes estimates of survival and capture probability for capture-recapture experiments on open animal populations.
Computes estimates of capture probability and population size for "closed" population capture-recapture data.
Computes estimates of survival (or any model parameter) with multinomially distributed data.
Computes estimates of daily survival rate for nest visitation data.
Computes expected coefficients of variation of survival and capture probability for use in the design of capture-recapture-resighting experiments.
Computes "species richness" or total number of species from emperical species abundance distribution data.