Oasis or Mirage ?
نویسنده
چکیده
This paper will review the design of statistical studies, and comment on the difficulty of drawing causal inferences from non-experimental data. The most basic design is a comparison of rates for two groups of subjects. Subjects in one group get the treatment of interest; subjects in the other group are the controls. The difficulty is ensuring that the groups are similar, apart from the treatment.
منابع مشابه
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