Calculates the raw Visual Fast Count (VFC) estimator of the mean abundance per transect

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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

1
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

See Also

GVFCMOM

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