anc | R Documentation |

Compute Power for One or Two Factor ANCOVA with a single covariate Takes means, sds, and sample sizes for each group. Alpha is .05 by default, alternative values may be entered by user Factor A can have up to four levels, Factor B, if used, can only be two

anc( m1.1, m2.1, m1.2, m2.2, m3.1 = NULL, m3.2 = NULL, m4.1 = NULL, m4.2 = NULL, s1.1 = NULL, s2.1 = NULL, s1.2 = NULL, s2.2 = NULL, s3.1 = NULL, s3.2 = NULL, s4.1 = NULL, s4.2 = NULL, r, s = NULL, alpha = 0.05, factors, levelsA = NULL, n )

`m1.1` |
Cell mean for First level of Factor A, First level of Factor B |

`m2.1` |
Cell mean for Second level of Factor A, First level of Factor B |

`m1.2` |
Cell mean for First level of Factor A, Second level of Factor B |

`m2.2` |
Cell mean for Second level of Factor A, Second level of Factor B |

`m3.1` |
Cell mean for Third level of Factor A, First level of Factor B |

`m3.2` |
Cell mean for Third level of Factor A, Second level of Factor B |

`m4.1` |
Cell mean for Fourth level of Factor A, First level of Factor B |

`m4.2` |
Cell mean for Fourth level of Factor A, Second level of Factor B |

`s1.1` |
Cell standard deviation for First level of Factor A, First level of Factor B |

`s2.1` |
Cell standard deviation for Second level of Factor A, First level of Factor B |

`s1.2` |
Cell standard deviation for First level of Factor A, Second level of Factor B |

`s2.2` |
Cell standard deviation for Second level of Factor A, Second level of Factor B |

`s3.1` |
Cell standard deviation for Third level of Factor A, First level of Factor B |

`s3.2` |
Cell standard deviation for Third level of Factor A, Second level of Factor B |

`s4.1` |
Cell standard deviation for Fourth level of Factor A, First level of Factor B |

`s4.2` |
Cell standard deviation for Fourth level of Factor A, Second level of Factor B |

`r` |
Correlation between covariate and dependent variable. |

`s` |
Overall standard deviation. Sets all cell sds equal |

`alpha` |
Type I error (default is .05) |

`factors` |
Number of factors (1 or 2) |

`levelsA` |
levels for factor A (up to four) |

`n` |
Sample Size per cell |

Power for One or Two Factor ANCOVA with a single covariate

anc(m1.1=.85,m2.1=2.5, s1.1 = 1.7, s2.1=1, m1.2=0.85, m2.2= 2.5, s1.2 = 1.7, s2.2=1, m3.1=0.0,m3.2=2.5, s3.1 = 1.7, s3.2=1, m4.1=0.6, m4.2 = 2.5, s4.1 = 1.7, s4.2=1, r= 0.4, n=251, factors =2,levelsA = 4)

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