Obtaining power or obtaining precision. Delineating methods of sample-size planning.

@article{Kelley2003ObtainingPO,
  title={Obtaining power or obtaining precision. Delineating methods of sample-size planning.},
  author={Ken Kelley and Scott Maxwell and Joseph R. Rausch},
  journal={Evaluation & the health professions},
  year={2003},
  volume={26 3},
  pages={
          258-87
        }
}
Sample-size planning historically has been approached from a power analytic perspective in order to have some reasonable probability of correctly rejecting the null hypothesis. Another approach that is not as well-known is one that emphasizes accuracy in parameter estimation (AIPE). From the AIPE perspective, sample size is chosen such that the expected width of a confidence interval will be sufficiently narrow. The rationales of both approaches are delineated and two procedures are given for… CONTINUE READING

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