ABSTRACT
In practice these are usually fairly simple and undisputed characteristics, such as signed authorizations, password security, official stamps, recorded evidence of who did what, and so on.
Attribute sample size Complex statistical calculations such as standard deviations or precise knowledge of population size are not usually required to work out a sample size for which the following is the most commonly used formula:
Sample size = reliability factor / precision proportion
In this case, as long as the precision is expressed as a proportion, usually the percentage maximum tolerable error rate (the upper precision level), the sample size will be the same for any large population.
