asymPermute | R Documentation |

Assess differences in amount and direction of asymmetric variation (only object symmetry)

```
asymPermute(x, groups, rounds = 1000, which = NULL)
```

`x` |
object of class symproc result from calling |

`groups` |
factors determining grouping. |

`rounds` |
number of permutations |

`which` |
select which factorlevels to use, if NULL, all pairwise differences will be assessed after shuffling pooled data. |

`dist` |
difference between vector lengths of group means |

`angle` |
angle (in radians) between vectors of group specific asymmetric deviation |

`means` |
actual group averages |

`p.dist` |
p-value obtained by comparing the actual distance to randomly acquired distances |

`p.angle` |
p-value obtained by comparing the actual angle to randomly acquired angles |

`permudist` |
vector containing differences between random group means' vector lenghts |

`permuangle` |
vector containing angles between random group means' vectors |

`groupmeans` |
array with asymmetric displacement per group |

`levels` |
character vector containing the factors used |

This test is only sensible if between-group differences concerning directional asymmetry have been established (e.g. by applying a MANOVA on the "asymmetric" PCscores (see also `procSym`

) and one wants to test whether these can be attributed to differences in amount and/or direction of asymmetric displacement. Careful interpretation for very small amounts of directional asymmetry is advised. The Null-Hypothesis is that we have the same directional asymmetry in both groups. If you want to test whether the angle between groups is similar, please use `angleTest`

.

`procSym`

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