vChapman: Estimated Variance of the Chapman Estimator

Description Usage Arguments Value Note Author(s) See Also Examples

View source: R/funcs.R

Description

Calculates the estimated variance of the Chapman estimator in a mark-recapture experiment, with given values of sample sizes and number of recaptures.

Usage

1
vChapman(n1, n2, m2)

Arguments

n1

Number of individuals captured and marked in the first sample. This may be a single number or vector of values.

n2

Number of individuals captured in the second sample. This may be a single number or vector of values.

m2

Number of marked individuals recaptured in the second sample. This may be a single number or vector of values.

Value

The estimate variance of the Chapman estimator, calculated as (n1+1)*(n2+1)*(n1-m2)*(n2-m2)/((m2+2)*(m2+1)^2)

Note

Any Petersen-type estimator (such as this) depends on a set of assumptions:

Author(s)

Matt Tyers

See Also

NChapman, seChapman, rChapman, pChapman, powChapman, ciChapman

Examples

1
vChapman(n1=100, n2=100, m2=20)

mbtyers/recapr documentation built on Sept. 13, 2021, 11:54 a.m.