Power (and Beta)

The probability of detecting a real effect when one exists

Power is the probability of detecting a given effect (eg. the MDE), when it exists. In other words, when there is a real effect, power is the probability of making a correct experimental decision and rejecting the null hypothesis.

  • Power (also known as Beta) is the sibling of alpha.
  • We commonnly set power to 0.8.
  • 1-power = Beta

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