Herd-level sensitivity for testing in a finite population

Inputs Input Values

  

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.

Sample size :
Population size (for finite populations) :
Test sensitivity :
Design prevalence :

Top

  Home  |   About this site  |   Glossary   |   References   |   Links   |  234 recent calculations


This site was created by Ausvet with funding from a range of sources.
It provides a range of epidemiological tools for the use of researchers and epidemiologists, particularly in animal health.
Please send any comments, questions or suggestions to Evan Sergeant
© 2018 Ausvet