This section describes any known exclusions from the survey population.
For survey collections, there is likely to be a difference between the intended population and the population actually able to be included in the survey. The survey population is also called the coverage, that is, the population the survey actually covers. Ideally the survey population should correspond exactly with the target population, however, the two populations may not match, so the conclusions based on survey data only apply to the survey population. Some units of interest in the intended population may be excluded from the survey for practical reasons, such as a remote geographic location, or age restrictions, whilst others may not be possible to contact, such as where units are missing from the list (frame) used to source survey participants.