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A dog, who fell into the ocean of statistics, tries to write down his ideas and notes to save himself.

Power Analysis

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Tags: Hypothesis Testing


In hypothesis testing situations,

  1. Determine the sample size required to detect an effect of a given size with a given degree of confidence
  2. Determine the probability of detecting an effect of a given size with a given level of confidence, under sample size constraints. (If the probability is unacceptably low, you’d wise be wise to alter or abandon the experiment.)

Null hypothesis significance experiment (NHST)

Four quantities

  1. sample size
  2. significance level
  3. power
  4. effect size



Sample sizes for detecting significant effects in a one-way ANOVA

Sample size curves for detecting correlations of various sizes


Kabacoff RI. R in Action. manning; 2010.

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