Utheria

Sample size and sample units

A numeric value on its own is not always that helpful for defining a sample size. For example, a measurement type such as 'Litter Size' might have a sample size referring to the number of litters recorded, or the number of females giving birth to litters. For a measurement type such as 'Population Density' a sample size may refer to number of individuals, number of encounters or total length of transects covered etc. To try and remove some of the ambiguity the miner should enter a numeric value in the sample size field and the most appropriate description of the unit of sample size from the sample size unit drop-down. For some measurement types such as 'Body Mass', there is no unit field, because the sample size will generally always be assumed to be number of individuals measured.


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