Chapman Estimator for closed populations

Uses Chapman's modified version of the Lincoln-Petersen estimator for a two-sample closed population abundance estimator.

Usage

chapman(r, n, m)

Arguments

r

the number of individuals marked in the initial sample.

n

the total number of individuals (marked and unmarked) encountered in the second sample.

m

the number of marked individuals encountered in the second sample

Value

A list containing:

N.hat

the abundance estimate

SE

the standard error of the abundance estimate

Examples

# Use simulation code to generate data and analyze it
if (FALSE) { # \dontrun{


 LP.sim(N=5E4, mark=300, recap=0.2,sample.fixed=TRUE)->sim.dat


 chapman(r=sim.dat$r,
          n=sim.dat$n,
          m=sim.dat$m)
} # }