This function populates the sumz.cp table using the resuls from function 'ivzsums' and, if 'boot'=TRUE, calls 'ivsums.f' to compute ivz sums filtered by pure and reliable taxa.

1 2 | ```
sumz.tab(ivzScores, ivz, srtEnv, sppmax, maxSumz = maxSumz,
maxFsumz = maxFsumz, minSplt = minSplt, boot = boot)
``` |

`ivzScores` |
The product of the 'getivz' function. A data matrix comprised of four submatrices including group membership, z scores, IndVals, and p values. |

`ivz` |
The product of the 'ivzsums' function. A data matrix comprised of two parallel vectors of sum(z-) and sum(z+) scores. |

`srtEnv` |
A sorted version of the environmental gradient. |

`sppmax` |
The taxon-specific summary output table from TITAN, passed to 'ivzsums.f'. |

`maxSumz` |
A vector of sum(z) maxima across bootstrap replicates. |

`maxFsumz` |
A vector of sum(z) maxima filtered by pure and reliable taxa across bootstrap replicates. |

`minSplt` |
The minimum split size used to partition the environmental gradient. The default is to use the argument specified by the original TITAN function call. |

`boot` |
A logical indicating whether the bootstrap procedure should be implemented. The default is to use the argument specified by the original TITAN function call. |

The function locates the env values of sum(z) maxima, then if 'boot'=TRUE, locates the the env value of the filtered sum(z) and provides bootstrap quantiles of both filtered and unfiltered distributions.

A list with two objects:

sumz.cp A second summary output table from TITAN to accompany 'sppmax'.

ivz.f The product of the 'ivzsums.f' function. A data matrix comprised of two parallel vectors of filtered sum(z-) and sum(z+) scores.

M. Baker and R. King

Baker, ME and RS King. 2010. A new method for detecting and interpreting biodiversity and ecological community thresholds. Methods in Ecology and Evolution 1(1): 25:37.

King, RS and ME Baker 2010. Considerations for identifying and interpreting ecological community thresholds. Journal of the North American Benthological Association 29(3):998-1008.

`ivzsums`

, `ivzsums.f`

,
`getivz`

, `titan`

Questions? Problems? Suggestions? Tweet to @rdrrHQ or email at ian@mutexlabs.com.

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