[R] Start Model for POLYCLASS

[Spencer Graves]

	  I have not seen a reply, so I will offer a few suggestions, even 
though I've never used the 'polspline' package.  I scanned several of 
the help pages and looked in "~\library\polspline' where R is installed 
on my hard drive and found no further documentation, and I found nothing 
new from RSiteSearch("polyclass").  Googling for 'polyclass' led me to 
"http://bear.fhcrc.org/~clk/soft.html", the home page for Charles 
Kooperberg, the author and maintainer.  If it were my problem, I might 
try writing him directly at the email address given in 
help(package="polyclass");  I'm including him as a "cc" on this reply.

	  I spent time looking at this, because 'polyclass', 'polymars' and 
'polspline' seem potentially related related to one of my secondary 
interests.  Unfortunately, I couldn't find sufficient documentation to 
allow me to proceed with the time I felt I could afford to invest in 
this right now.

	  If it were my problem, before I wrote another email about this, I'd 
first list the function 'polyclass', make a local copy, then work 
through an example line by line using 'debug(polyclass)'.  This 'debug' 
facility is remarkably powerful and easy to use.  I've solved many 
problems like this using 'debug' in this way.

	  If that failed to provide the necessary enlightenment, I'd submit 
another post including a self-contained example based on a modification 
of the 'iris' example featured in the 'polyclass' help page.  Your 
example is NOT self contained, so I would NOT use that.  Using the 
'iris' example would make it much easier to explain clearly what you 
want.  It also makes it much easier for someone like me to experiment 
with alternatives and describe what I did in terms of a tested example.

	  Hope this helps.
p.s.  I suggest you also review the posting guide! 
"www.R-project.org/posting-guide.html".

Xiaogang Su wrote:
> Dear all, 
> 
> I have a question on how to set up the starting model in POLYCLASS and
> make sure the terms in the starting model retained in the final
> POLYCLASS model. 
> 
> In the function POLYMARS, this can be done using the STARTMODEL option.
> See below for example, I started with model 
> y= b0 + b1*X1 + b2*X2 + b3*X4 + b4*X5 + b5*X2*X5 + e
> 
>> m00 <- matrix(c(
>      1,  NA, 0, NA, 1,     
>      2,  NA, 0, NA, 1,     
>      4,  NA, 0, NA, 1,     
>      5,  NA, 0, NA, 1,
>      2,  NA, 5, NA, 1),nrow = 5, ncol=5, byrow=TRUE);
> 
>> m2 <- polymars(response=PID2$y, predictors=PID2[,1:7], 
> startmodel=m00) 
>> summary(m2)  
> 
> But I could not figure out how this works for POLYCLASS. There is an
> option FIT in POLYCLASS, which needs to be a POLYCLASS object though. 
> 
> Any suggestion or information is greatly appreciated. 
> 
> Sincerely,
> Xiaogang Su
> 
> 
> ================================
> Xiaogang Su,  Assistant Professor
> Department of Statistics and Actuarial Science
> University of Central Florida
> Orlando, FL 32816
> (407) 823-2940 [O]
> xiaosu at mail.ucf.edu
> http://pegasus.cc.ucf.edu/~xsu/
> 
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