search for: dufrene

Displaying 4 results from an estimated 4 matches for "dufrene".

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2005 Aug 08
2
INDVAL and mvpart
Hi, I'd like to perform Dufrene-Legendre Indicator Species Analysis for a multivariate regression tree. However I have problems with arguments of duleg(veg,class,numitr=1000)function. How to obtain a vector of numeric class memberships for samples, or a classification object returned from mvpart? thanks in advance -- Best rega...
2005 Sep 19
4
indicator value in labdsv
Hi, I'm trying to find out what threshold of indicator value in labadsv should be used to accept a specie as an indicator one? So far I assumed that indval=0.5 is high enough to avoid any mistakes but it was based only in my intuition. I'd be greatful for any advise best regards Agnieszka
2009 Jun 17
0
About "duleg" Indicator Species Analysis
I have a question about the function "duleg" in the package "labdsv". How the p-value is calculated ? Dufrene and Legendre (1997) have shown two calculation way ; one is the difference between the observed value and the mean of those obtained from random permutations and another is the rank of the observed value in the randomly generated distribution ordered in decreasing order. Which way does this functio...
2009 Oct 10
7
SPSS long variable names
Hello guys I am new to this list and for R too. I am wondering if there is a patch for the SPSS reading code on the foreign package, in order to be able to read long variable names. Right now read.spss() just trunc the names to 8 characters. Or if someone could help me on other way: I have to process everyday a lot of SPSS Syntax Files and Dat files that come from one system that can only export