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This utility estimates the probability of detecting disease
(herd-sensitivity) in a
finite population, if it is present at the specified
design prevalence,
assuming a test of
known sensitivity and 100%
specificity and that all samples have a negative test result. These analyses
use an approximation of the hypergeometric distribution (MacDiarmid, SC (1988).
NZ Vet J, 36:39-42).
Because test specificity is assumed to be 100%, herd-specificity for these calculations is also 100%.
Inputs are the sample size tested, the population size, test sensitivity
and the design (target) prevalence.
Outputs are:
- the herd-level sensitivity for the given sample size, population size, test sensitivity and design prevalence; and
- a table of herd-sensitivity values for a range of design prevalence
and sample size values for the specified population size.
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