Description Usage Arguments Details Value References See Also Examples

Find extreme values in ecological community data

1 2 |

`x` |
array of species data |

`mult` |
SD threshold for 'outliers' = the number of SD's away from
the mean |

`method` |
distance measure; follows |

`metric` |
defaults to 'SD'; only other alternative is 'MAD' |

`plot` |
logical, should a histogram of distances be drawn? |

`perc` |
numeric, returns outlier values beyond the specified percentile |

`pick` |
numeric, returns this number of most extreme outliers |

`...` |
further arguments passed to other methods |

Outlier analysis based on community distances. Emulates PC-ORD, but see also McCune and Grace (2002).

A data frame with plot identifiers, calculated distances, and standard deviations from the mean distance, either with or without a histogram.

McCune, B., and J. B. Grace. 2002. Analysis of Ecological Communities. MjM Software, Gleneden Beach, Oregon, USA. 304 pp.

`outlier_uni`

for univariate analog.

Other outlier functions: `outlier_uni`

1 2 3 4 5 6 7 8 | ```
require(vegan)
data(dune)
set.seed(19)
spe <- rbind(dune, runif(ncol(dune),0,1000)) # add an outlier row
outlier_multi(spe, mult=3, plot=FALSE)
outlier_multi(spe, mult=3)
outlier_multi(spe, perc=5)
outlier_multi(spe, pick=5)
``` |

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