search for: usctmx1106

Displaying 5 results from an estimated 5 matches for "usctmx1106".

2005 Nov 11
0
[Fwd: Re: no package 'Matrix' at the repositories]
...Liaw, Andy <andy_liaw at merck.com> CC: 'Sean Davis' <sdavis2 at mail.nih.gov>, Spencer Graves <spencer.graves at pdf.com>, r-help <R-help at stat.math.ethz.ch>, Douglas Bates <bates at stat.wisc.edu> References: <39B6DDB9048D0F4DAD42CB26AAFF0AFAFED597 at usctmx1106.merck.com> Liaw, Andy wrote: > If you are installing from Windows, the current version of Matrix apparently > doesn't build automatically on Windows. See: > > http://cran.r-project.org/bin/windows/contrib/2.3/check/Matrix-check.log > > (That's for R-devel. There...
2009 Apr 13
2
Random Forests Variable Importance Question
I am trying to use the random forests package for classification in R. The Variable Importance Measures listed are: -mean raw importance score of variable x for class 0 -mean raw importance score of variable x for class 1 -MeanDecreaseAccuracy -MeanDecreaseGini Now I know what these "mean" as in I know their definitions. What I want to know is how to use them. What I am trying to
2006 Mar 08
0
survival
...w, Andy" <andy_liaw at merck.com> Subject: Re: [R] reading in only one column from text file To: "'mark salsburg'" <mark.salsburg at gmail.com>, R-help at stat.math.ethz.ch Cc: r-help at stat.math.ethz.ch Message-ID: <39B6DDB9048D0F4DAD42CB26AAFF0AFAFED8DA at usctmx1106.merck.com> Content-Type: text/plain read.table("datafile", colClasses=c("NULL", "numeric"), ...) or something like that. Andy From: mark salsburg > > How do I manipulate the read.table function to read in only > the 2nd column??? > > [[alterna...
2008 Oct 15
0
R-help Digest, Vol 67, Issue 31
...quot;Liaw, Andy" <andy_liaw at merck.com> Subject: Re: [R] ariable Importance Measure in Package RandomForest To: <linuxkaffee at gmx.net> Cc: r-help at r-project.org, Uwe Ligges <ligges at statistik.tu-dortmund.de> Message-ID: <39B6DDB9048D0F4DAD42CB26AAFF0AFA063CFF24 at usctmx1106.merck.com> Content-Type: text/plain; charset="us-ascii" The randomForest package is based on Breiman & Cutler's original code, which grows trees using the CART algorithm. The Gini criterion for splitting nodes is hard-coded in the Fortran. If you want info gain as measure of...
2009 Jun 01
1
installing sn package
...rom: "Liaw, Andy" <andy_liaw@merck.com> Subject: Re: [R] Constrained fits: y~a+b*x-c*x^2, with a,b,c >=0 To: "Berwin A Turlach" <berwin@maths.uwa.edu.au>, <amvds@xs4all.nl> Cc: r-help@r-project.org Message-ID:     <39B6DDB9048D0F4DAD42CB26AAFF0AFA074CEEBB@usctmx1106.merck.com> Content-Type: text/plain; charset="us-ascii" There's also the "nnls" (non-negative least squares) package on CRAN that might be useful, although I'm puzzled by the negative sign in front of c in Alex post... Cheers, Andy From: Berwin A Turlach > &gt...