R help - Oct 2007 - data structure for plsr

All,

I am working with NIR spectral data and it was great to find that the example in
?plsr also used spectral data.  Unfortunately, I am having difficulty figuring
out how the "yarn" dataset is structured to allow for the plsr model
to read:

library(pls)
data(yard)
yarn.oscorespls <- mvr(density ~ NIR, 6, data = yarn, validation =
"CV", method = "oscorespls")

dim(yarn)

yarn


Specifically, it is VERY convenient to be able to have the ~256 variables to be
used in the model defined by NIR term.  When I use dim(yarn) it claims [1] 28 
3.  When I call "yarn" there is WAY more data than 28  3.  How does
this work?  I have 186 spectral bands to run in plsr and I would really like to
be able to call them using NIR or something simlar.  I have tried labeling my
spectral data ASD.###, where ### is the wavelength, but I keep getting
data.frame errors.

Ross



*******************************************************************
Ross Bricklemyer
Dept. of Crop and Soil Sciences
Washington State University
291D Johnson Hall
PO Box 646420
Pullman, WA 99164-6420
Work: 509.335.3661
Cell/Home: 406.570.8576
Fax: 509.335.8674
Email: rsb at wsu.edu

?

try:

str(yarn)

to see what the structure is.

On 10/16/07, Bricklemyer, Ross S <rsb at wsu.edu>
wrote:
> All,
>
> I am working with NIR spectral data and it was great to find that the
example in ?plsr also used spectral data.  Unfortunately, I am having difficulty
figuring out how the "yarn" dataset is structured to allow for the
plsr model to read:
>
> library(pls)
> data(yard)
> yarn.oscorespls <- mvr(density ~ NIR, 6, data = yarn, validation =
"CV", method = "oscorespls")
>
> dim(yarn)
>
> yarn
>
>
> Specifically, it is VERY convenient to be able to have the ~256 variables
to be used in the model defined by NIR term.  When I use dim(yarn) it claims [1]
28  3.  When I call "yarn" there is WAY more data than 28  3.  How
does this work?  I have 186 spectral bands to run in plsr and I would really
like to be able to call them using NIR or something simlar.  I have tried
labeling my spectral data ASD.###, where ### is the wavelength, but I keep
getting data.frame errors.
>
> Ross
>
>
>
> *******************************************************************
> Ross Bricklemyer
> Dept. of Crop and Soil Sciences
> Washington State University
> 291D Johnson Hall
> PO Box 646420
> Pullman, WA 99164-6420
> Work: 509.335.3661
> Cell/Home: 406.570.8576
> Fax: 509.335.8674
> Email: rsb at wsu.edu
>
>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?