This is an internal function. `power.f`

computes statistical power for F tests on means in the analysis of variance.

1 | ```
power.f(u, n, delta, sig.level = 0.05)
``` |

`u` |
degree of freedom of the numerator of the F ratio |

`n` |
sample size |

`delta` |
Cohen's |

`sig.level` |
a numeric contains the significance level (default 0.05) |

Return a numeric containing the statistical power.

Yasuyuki Okumura

Department of Social Psychiatry,

National Institute of Mental Health,

National Center of Neurology and Psychiatry

yokumura@blue.zero.jp

Cohen J (1988). Statistical power analysis for the behavioral sciences (2nd ed). Hillsdale, NJ: Erlbaum.

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