Читать книгу Practical Statistics for Nursing and Health Care - Jim Fowler - Страница 24

Choice of correct survey method is extremely important. The best approaches to sampling from a finite population, as in our asthma example, are to use either a simple random sample or a stratified random sample. Stratification is used when it is known that the response of interest is related to some factor (e.g. age or sex).

Choice of appropriate sampling method is not always obvious, and may involve a mixture of the methods we have described. Always seek advice if you are in doubt, as the cost of advice in relation to the cost of obtaining the sample is very small. Scheaffer et al. (2011) provide a very good introduction to all aspects of survey sampling.