Elizabeth E. Holmes and William F. Fagan. 2002. Validating population viability analysis for corrupted data sets. Ecology 83:2379-2386.

Supplement 1

S-PLUS code for estimating Dennis-Holmes parameters and risk metrics from a time series.
Ecological Archives E083-047-S1.

Copyright

Authors
File List
Description

Authors

Elizabeth E. Holmes
Cumulative Risk Initiative
Northwest Fisheries Science Center
2725 Montlake Blvd. East
Seattle, WA 98112-2097
U.S.A.
Email: eli.holmes@noaa.gov

William F. Fagan
Department of Biology
Arizona State University
Tempe, AZ 85287-1501
U.S.A.
Email: bfagan@asu.edu

File list

S-Plus code:

DHMethod.txt
riskmetrics.txt

All files are in ASCII text.

Description

Following are S-Plus files (in ascii format) to estimate parameters and risk metrics from a time series using the Dennis-Holmes method.

The file DHMethod.txt contains code to estimate using running sums and 2 using the slope method from a time series of counts.

The file riskmetrics.txt contains code to estimate risk metrics given estimates of and 2. The following metrics are calculated: confidence intervals on , probability of extinction with 95% confidence intervals, probability of decline with 95% confidence intervals, probability of observing extinction, and probability of observing a given decline.

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