Covered region estimate of abundance from Horvitz-Thompson-like estimator

Computes H-T abundance within covered region by sample.

Usage

covered.region.dht(obs, samples, group)

obs: observations table
samples: samples table
group: if TRUE compute abundance of group otherwise abundance of individuals

Nhat.by.sample - dataframe of abundance by sample

Internal function called by dht and related functions

Jeff Laake