Description Usage Arguments Details Note Examples

Constructs a plot of P values associated with pairwise comparisons of estimated marginal means.

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`emm` |
An |

`method` |
Character or list. Passed to |

`by` |
Character vector of variable(s) in the grid to condition on. These will
create different panels, one for each level or level-combination.
Grid factors not in |

`sort` |
Logical value. If |

`values` |
Logical value. If |

`rows` |
Character vector of which |

`xlab` |
Character label to use in place of the default for the P-value axis. |

`ylab` |
Character label to use in place of the default for the primary-factor axis. |

`xsub` |
Character label used as caption at the lower right of the plot. |

`add.space` |
Numeric value to adjust amount of space used for value labels. Positioning of value labels is tricky, and depends on how many panels and the physical size of the plotting region. This parameter allows the user to adjust the position. Changing it by one unit should shift the position by about one character width (right if positive, left if negative). |

`...` |
Additional arguments passed to |

Factor levels (or combinations thereof) are plotted on the vertical scale, and P values are plotted on the horizontal scale. Each P value is plotted twice – at vertical positions corresponding to the levels being compared – and connected by a line segment. Thus, it is easy to visualize which P values are small and large, and which levels are compared. In addition, factor levels are color-coded, and the points and half-line segments appear in the color of the other level. The P-value scale is nonlinear, so as to stretch-out smaller P values and compress larger ones. P values smaller than 0.0004 are altered and plotted in a way that makes them more distinguishable from one another.

If `xlab`

, `ylab`

, and `xsub`

are not provided, reasonable labels
are created. `xsub`

is used to note special features; e.g., equivalence
thresholds or one-sided tests.

The ggplot2 package must be installed in order for `pwpp`

to work.

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emmeans documentation built on Dec. 1, 2019, 1:15 a.m.

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