This function computes general statistics on a data.frame of ring-width series. This function is a changed version of the Andrew Bunn's rwi.stats function from the dplR package (Bunn, 2008)

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`rwl ` |
a data.frame of ring widths |

`stc ` |
a vector of three integers giving the Site-Tree-Core mask. Defaults to c(5,2,1) and these three values should sum to eigth. The stc[1] gives the number of characters used to define the site code, stc[2] defines the tree mask and the core ids is given by the last element of the vector stc[3]. |

A data.frame with the following values: 'start', 'end', 'tree', 'core', 'n.tot', 'n.wt', 'n.bt','r.tot','r.wt', 'r.bt', 'c.eff', 'r.eff', and 'eps'.

`start ` |
the first year. |

`end ` |
the last year. |

`tree ` |
the number of trees. |

`core ` |
the number of cores. |

`n.tot ` |
the number of unique combinations of the input series (i.e., 1/2*n*[n-1]). |

`n.wt ` |
the total number of unique combinations of the within-tree series. |

`n.bt ` |
the total number of unique combinations of the between-tree series. |

`r.tot ` |
the mean of all correlation between different cores. |

`r.wt ` |
the mean of correlations between series from the same tree over all trees. |

`r.bt ` |
the mean interseries correlation between all series from different trees. |

`c.eff ` |
the effective number of cores. |

`r.eff ` |
the effective signal calculated as [rbar.bt / (rbar.wt + (1-rbar.wt) / c.eff)]. |

`eps ` |
the expressed population signal. |

Bunn, A. 2008. A dendrochronology program library in R (dplR). Dendrochronologia 26:115-124.

Cook, E.R., Kairiukstis, L.A. 1990. Methods of Dendrochronology: applications in the environmental sciences. Kluwer Academic Publishers.

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