POPM 3240 Lecture Notes - Lecture 5: Sampling Frame, Clinical Trial, World Health Organization

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A census involves systematically acquiring and recording relevant information about every member of a given population. The census of canada, conducted by statistics canada, is an example of this. A sample involves selecting a portion of the population and acquiring and recording relevant information about those selected members. Now a census can be a great way to get accurate and detailed information about a given population. However, it is normally impractical to study a whole population. For these reasons, sampling is often the preferred approach for epidemiologists, as sampling methods, if done well, tend to overcome many of the limitations to conducting censuses. Importantly, sampling allows investigators to describe the characteristics of a population. Sampling also allows investigators to assess specific associations between factors (exposures) and disease (outcome). There are three main stages to sampling: determine who/what to sample, determine how (cid:455)ou"(cid:396)e goi(cid:374)g to (cid:272)hoose these su(cid:271)je(cid:272)ts, determine how many (cid:455)ou"ll (cid:374)eed to (cid:271)e (cid:272)o(cid:374)fide(cid:374)t i(cid:374) (cid:455)ou(cid:396) fi(cid:374)di(cid:374)gs.

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