Sample Selection

In clinical psychology, as in other areas of psychological science, one may want to draw conclusions at the level of an entire population. Sample selection is the procedure in which a subset of individuals from a population is selected to infer characteristics of the whole population. For example, in the case of judging the success of a therapeutic intervention for major depression, the question is whether that therapy works for the entire population of people with major depression, not just for the group of patients on which the therapy was tested. A population is defined as the complete set of individuals who share some characteristic. The population of human beings, for example, is simply the set of all humans sharing the characteristic of being ...

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