obsProb: obsProb

In NINAnor/SurveyPower: Functions for calculating power of survey design

Description

Function that produces empirical estimates of probability to detect a foreign species, and associated costs based on varying occurrences, detectabilities and survey schemes.

Usage

obsProb(occProb, detectProb, locations, visits, visitCost)

Arguments

occProb	vector of occurence probabilities to test
detectProb	vector of detection probabilities
locations	vector of number of locations to visit/sample
visits	vector of number of visits per sample
visitCost	vector of costs of each visit
nBoot	number of bootstrap samples to calculate std error of percent detected

Value

Returns a tibble where percDetected shows in percentage, how many times it is expected to find at least one record of the species, given the occurrence probabilities in each location, the detection probabilities if it is present, the number of locations sampled, and the number of samples per location. It also shows the standard error on the estimated percentage detected, based on the bootstrap

Examples

{
tt <- detectProp(occProb = seq(0.01, 0.9, by = 0.05),
detectProb = 0.8,
locations = 30,
visits =  4,
visitCost = 10,
nBoot =  9999)

}

NINAnor/SurveyPower documentation built on May 7, 2019, 10:43 p.m.