Description Usage Arguments Author(s) See Also

Calculates a confidence inteval for a common slope (called by slope.com)

1 | ```
com.ci(b, varb, crit, z, n, l1, l2, method, lambda, res.df, r.factor)
``` |

`b` |
Common slope estimate. |

`varb` |
Estimated variance of the common slope. |

`crit` |
Critical value to be used in confidence interval calculation. |

`z` |
Variances and covariances of each group. |

`n` |
Sample sizes of each group. |

`l1` |
Variance of fitted axis scores, for each group. |

`l2` |
Variance of fitted residuals, for each group. |

`method` |
See slope.com for details. |

`lambda` |
Error variance ration (implied by choice of method. |

`res.df` |
Residual degrees of freedom, for each group. |

`r.factor` |
A vector of "robust factors" for each group, default value 1. Variance estimates are rescaled by this factor when using robust inference. |

Warton, D.I.David.Warton@unsw.edu.au, J. Ormerod, & S. Taskinen

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