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331. Note: On the Bias and Estimated Variance of Chapman's Two-Sample Capture-Recapture Population Estimate

Janet T. Wittes
Biometrics
Vol. 28, No. 2 (Jun., 1972), pp. 592-597
DOI: 10.2307/2556173
Stable URL: http://www.jstor.org/stable/2556173
Page Count: 6
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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.
331. Note: On the Bias and Estimated Variance of Chapman's Two-Sample Capture-Recapture Population Estimate
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Abstract

This note demonstrates that Chapman's estimate NU for population size in a two-sample capture-recapture experiment is unbiased when the sum of the sample sizes is at least as great as the population size. Further, an estimate of the variance of NU is proposed and is shown to be unbiased when n1 + n2 ≥ N.

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