4.1.1. Coverage error

Coverage error arises when the survey population listed in the “sampling frame” – the list from which the sample selection is made (see section 6.2., usually of beekeepers in a particular country or region) – does not match well with the target population (the population about whom an inference is to be made; usually the set of all beekeepers in that country or region). The results of the survey will be seriously affected if those omitted from the sampling frame differ in some respect relevant to the aims of the investigation (in size of enterprise, for example, so that perhaps large commercial beekeepers are not represented).