@hinduja1234 wrote:
I am currently studying about an approach of data collection called case-control sampling
The case-control is a type of epidemiological observational study. An observational study is a study in which subjects are not randomized to the exposed or unexposed groups, rather the subjects are observed in order to determine both their exposure and their outcome status and the exposure status is thus not determined by the researcher.
I have also read that the case-control sampling is most effective when there is a large difference in the prior probabilities of the classes.I want to know the reason behind this.
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