GVFC {emon} | R Documentation |
Calculates the raw Visual Fast Count (VFC) estimator of the mean abundance per transect
Description
The function considers the counts per segment and uses them sequentially until d
positive counts
are obtained or until all s
segments have been considered. If we assume that u
counts are used (of
which some may be zero) then
the visual fast count estimator is the mean over the u
counts multiplied by s
. This function is used
by GVFCMOM
to obtain the method of moments VFC estimator - which has reduced bias compared to the
raw VFC estimator.
Usage
GVFC(counts, s, d)
Arguments
counts |
Vector of length s that contains a count for each segment |
s |
Number of segments |
d |
Number of positive segment counts needed before counting stops |
Value
The raw VFC estimate of the segment mean
Author(s)
Jon Barry: jon.barry@cefas.co.uk
References
Barry J, Eggleton J, Ware S and Curtis M (2015) Generalizing Visual Fast Count Estimators for Underwater Video Surveys. Ecosphere. http://www.esajournals.org/doi/full/10.1890/ES15-00093.1