DARTER (Diffusion Approximation Tools for Extinction Risk Estimation)

Project information

Project members
brice.semmens e2holmes


This program allows one to walk through the steps required to conduct a population viability analysis, or PVA, using a population time time series. The model outputs probabilities of extinction as a function of time steps into the future, and importantly, gives confidence intervals for these probabilities.

This tool has two major advantages over traditional PVA techniques:

1) It uses a state-space Kalman filter that allows for both process and non-process error.

So what's the big deal? --Functionally it filters the data, and allows a more accurate fit for population parameters of interest.2) It uses a Bayesian sampling-importance-resampling algorithm to fully address uncertainty in the parameter estimates given the data.Rather than developing a single function that describes the probability of population extinction through time, we can use the uncertainty in parameter estimates to develop 'probabilities of probabilities', or, the uncertainty surrounding the probability of extinction through time.


DARTER (Diffusion Approximation Tools for Extinction Risk Estimation) /
  • Download DARTER (Diffusion Approximation Tools for Extinction Risk Estimation) as zip archive Download
Name Status Rev Size Updated Downloads Brief Description Actions
1 454.4 KB 08/23/2007 17:19 PDT 113 113 f
1 480 KB 08/23/2007 17:09 PDT 121 121 f



112 project downloads
234 individual file downloads

Sculpin 0.2 | xhtml | problems or comments? | report bugs