Grouped regression

Hi, Thanks for the reply.

Sex[120:144]<-factor(TG) #Renaming some males to transgender, to
create 3 groups, male, female and transgender
Sorry, that should have been

Sex[120:144]<-factor('TG')

The original line did not have the quotes.
I showed you how to fix that in the reply which you have not copied.  
Is this further evidence that you have not read the Posting Guide?

I'm getting the sense that this is homework. You offer no information
about you business or academic affiliations and appear not to have
read the Posting Guide. Also setting up regressions is covered in the
"Introduction to R" which you are requested to have reviewed before
asking questions on Rhelp. Section 11 would be particularly relevant
here.
No, it is not homework, I just used the cats dataset to produce a  
working
example, as the Posting Guide suggests. I did not get the  
information I was
looking for (how to create a subset regression where the slope and/or
intercept for some factors were constrained to be the same) from the
"Introduction to R" which I did look at (along with searching the  
archives
of R-help and doing  a general Google search and going through the  
first 100
or so results and looking at Julian Faraway's book on Regression  
Analysis as
well as some material from John Fox...
The term "subset regression" is not one I recognize but it sounded  
from your description that you wanted what you would get with:

 > out<-lm(Bwt~Sex+Hwt)
 > out

Call:
lm(formula = Bwt ~ Sex + Hwt)

Coefficients:
(Intercept)         SexM        SexTG          Hwt
      1.4716       0.2144       0.6854       0.0965
--
View this message in context: http://r.789695.n4.nabble.com/Grouped-regression-tp4635761p4635771.html
Sent from the R help mailing list archive at Nabble.com.
It is unfortunate that you continue (along with so many users of  
Nabble) to fail to include context.

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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT

Grouped regression

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