Читать книгу Practical Statistics for Nursing and Health Care - Jim Fowler - Страница 16

We have to distinguish between the target and study populations. The target population in the asthma example above is the number of patients registered with the GP practice who have asthma. The study population consists of all patients who could actually be selected to form the sample, i.e. those who are known to have asthma. For example, a proportion of the target population may not know they have asthma, will not therefore be registered and, thus, will not form part of the study population. Ideally, the ‘target’ and ‘study’ populations coincide.