You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Quantifying the Effects of Unequal Catchabilities on Jolly-Seber Estimators Via Sample Coverage
W.-D. Hwang and Anne Chao
Vol. 51, No. 1 (Mar., 1995), pp. 128-141
Published by: International Biometric Society
Stable URL: http://www.jstor.org/stable/2533320
Page Count: 14
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Using the concept of sample coverage, we derive an approximation of the bias in the Jolly-Seber population size estimators due to heterogeneity of capture probabilities. The resulting bias is expressed as a function of sample coverage, average capture probability, and the coefficient of variation of individual capture probabilities. The effect of unequal catchabilities on the Jolly-Seber survival rate estimators is also briefly discussed. We propose new population size estimators which incorporate the heterogeneity of capture probabilities. A simulation study investigates the performance of the approximation formulas of biases and the proposed estimation procedure. A real data set of male black-kneed capsids discussed in Jolly (Biometrika 52, 225-247, 1965), Seber (The Estimation of Animal Abundance, 1982), and Burnham (In Estimation of Analysis of Insect Populations, pp. 416-435, 1989) illustrates the method.
Biometrics © 1995 International Biometric Society