EpiTools - Risk-based Surveillance

These calculators can be used for the simple analysis of risk-based surveillance. They are simplified versions of the scenario-tree modelling tools for the analysis of complex surveillance systems to demonstration freedom from disease or for the early detection of disease (available at http://freedom.ausvet.com.au). These calculators use simple common surveillance system structures that allow the calculation of the sensitivity of a risk-based or biased surveillance system, and the calculation of the required sample size to achieve a target sensitivity

Click here for Some important formulae for freedom analyses.

1-stage survey with single risk factor

Sample size

Population sensitivity and confidence of freedom

2-stage survey with single risk factor at cluster level

Sample size

Population sensitivity and confidence of freedom

2-stage survey with risk factors at both cluster and unit levels

Sample size

Population sensitivity and confidence of freedom


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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
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