Calculating the Sample Size When Testing r

When you come across a study in which the appropriate sample size was determined prior to the collection of any data, give the researcher some bonus points for taking the time to set up the study with sensitivity to both Type I and Type II errors. When you come across a study in which the power associated with the test(s) conducted on the correlation coefficient(s) is computed in a post hoc sense, give the researcher only a few bonus points. And when you come across a study in which there is no mention whatsoever of statistical power, award yourself some bonus points for detecting a study that could have been conducted better than it was.

(From Chapter 9, p. 220)

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Schuyler W. Huck
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