Re: [R] Package to remove collinear variables

2012-08-09 Thread Roberto Moscetti
Thank you very much for your help. Really appreciated. Best regards, Roberto Il 07/08/2012 12:18, John C Frain ha scritto: For background have a look at http://en.wikipedia.org/wiki/Multicollinearity. I have also used Regression Diagnostics: Identifying Influential Data and Sources of

Re: [R] Package to remove collinear variables

2012-08-07 Thread John C Frain
For background have a look at http://en.wikipedia.org/wiki/Multicollinearity. I have also used Regression Diagnostics: Identifying Influential Data and Sources of Collinearity (Wiley Series in Probability and Statistics) by David A. Belsley, Edwin Kuh and Roy E. Welsch Sections 1.9 to 1.12 of

Re: [R] Package to remove collinear variables

2012-08-06 Thread Gabor Grothendieck
On Sat, Aug 4, 2012 at 11:27 PM, Roberto rmosce...@unitus.it wrote: Hi, I need to remove collinear variables to my Near-Infrared table of spectra. What package can I use? Something simple, because I am a novice about statistic. There many methods of assessing multicollinearlity but to

Re: [R] Package to remove collinear variables

2012-08-05 Thread Uwe Ligges
On 05.08.2012 05:27, Roberto wrote: Hi, I need to remove collinear variables to my Near-Infrared table of spectra. What package can I use? Something simple, because I am a novice about statistic. Remove those where isTRUE(all.equal(cor(x, y), 1)) is TRUE? Uwe Ligges Thank you.

Re: [R] Package to remove collinear variables

2012-08-05 Thread Roberto
I do not know, because I tried to use rfe function (Backwards Feature Selection, Caret Package) to select wavelengths useful for a prediction model. Otherwise, rfe function give me back a lot of warning messages about collinearity between variables. So, I do not know if your script can be useful.

Re: [R] Package to remove collinear variables

2012-08-05 Thread Jeff Newmiller
There is no magic bullet (package) for your problem. You must either learn enough statistics to understand how to analyze your data, or consult with someone who does. FWIW collinearity is not in general amenable to automatic removal. However, you can identify which inputs are collinear with

Re: [R] Package to remove collinear variables

2012-08-05 Thread Roberto Moscetti
Hi, thank you for your help. I know, I need to learn enough statistics to understand how to process my data. The reason because of I write on this forum is to ask to people a way to learn. I am a postharvest researcher and statistic is not my main field, so I try to do my best. Do you know a

[R] Package to remove collinear variables

2012-08-04 Thread Roberto
Hi, I need to remove collinear variables to my Near-Infrared table of spectra. What package can I use? Something simple, because I am a novice about statistic. Thank you. Best regards, Roberto -- View this message in context: