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===Required precision===
===Required precision===
In the case of descriptive studies, this relates to the width of the 95% confidence interval. For example, you may want to estimate the seroprevalence to Bluetongue virus to within ±10% of the true population seroprevalence, or you may want to estimate the mean skin thickness of a group of cattle following tuberculin testing to within ±1mm of the true population mean. The concept of precision is also used in analytic studies, in the form of the minimum difference between groups which you wish to detect. As this is closely associated with power calculations, it is covered in the 'power' section below.
===Level of confidence===
===Power===
[[Category:Veterinary Epidemiology - Introduction|F]]
[[Category:Veterinary Epidemiology - Introduction|F]]