[R] Dataframes in PLS package

[westland]

R still doesn't seem to recognize the data.frame ...  I get a [6] ERROR: 
object 'depy.w' not found from the following code:

dep <- pls[,1:4]
ind <- pls[,5:8]
eqn <- data.frame(depy = dep, indx = ind) 
apls <- plsr(depy.w + depy.h + depy.d + depy.s ~ indx.a + indx.i + indx.r +
indx.x,  data=eqn)


BUT .... I DID try to cbind() these after add-concatenating them (not sure
exactly what I am doing) like so ...

apls <- plsr(cbind(depy.w ,depy.h , depy.d , depy.s) ~ cbind(indx.a , indx.i
, indx.r,indx.x), data=eqn)

And this seems to do the trick ... here is my output.


> summary(apls)
Data: 	X dimension: 10000 4 
	Y dimension: 10000 4
Fit method: kernelpls
Number of components considered: 4
TRAINING: % variance explained
          1 comps    2 comps    3 comps    4 comps
X       1.000e+02  1.000e+02  1.000e+02  100.00000
depy.w  9.138e-03  9.362e-03  1.087e-02    0.01160
depy.h  4.844e-04  5.010e-03  5.484e-03    0.01304
depy.d  1.900e-02  1.915e-02  1.919e-02    0.01963
depy.s  2.532e-03  1.010e-02  1.104e-02    0.01171


Unfortunately, I still don't understand what I'm doing ... I believe
cbind(...) forced the two data.frames depy and indx.   Can anyone perhaps
give me a clearer explanation?

-----
J. Christopher Westland
Professor, Information & Decision Sciences, University of Illinois - Chicago
601 S. Morgan Street (UH2400) Chicago, IL    60607-7124
Telephone       +1.312.860.0587 
Google Voice  +1.209.757.8849
westland at uic.edu
http://uic.edu/~westland
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