R help - Feb 2000 - MA / RMA / Type II regression?

For starters, let me say again how impressive R is, and how all of the
effort that has gone into R shines through clearly. It is an amazing
program, and I am frequently pleasantly surprised to find out how powerful
and capable R is. Finding the interface to xgobi is the latest pleasant
surprise.

Are there functions in R for Major Axis and Reduced Major Axis regression? I
have OBS-RESID graphs of two of my regressions showing a linear increasing
trend, indicating the inappropriate use of Type I regression; I upgraded to
R 0.90.1 and after looking through the help pages, didn't see anything that
seemed what I needed. LQS didn't quite seem what I was looking for.

Any pointers are greatly appreciated.

Thanks,

Pete

-- 
Pete St. Onge - McGill U.  Limnology - Fun with Ropes & Buckets
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"Pete St. Onge" <pete at seul.org> writes:
> Are there functions in R for Major Axis and Reduced Major Axis regression?
I
> have OBS-RESID graphs of two of my regressions showing a linear increasing
> trend, indicating the inappropriate use of Type I regression; I upgraded to
> R 0.90.1 and after looking through the help pages, didn't see anything
that
> seemed what I needed. LQS didn't quite seem what I was looking for.
(What is MA/RMA regression? I don't know them, not by that name
anyway.) I hope you plotted FIT vs. residuals there and not really OBS
vs. resid. The latter are well-known to generate apparent linear
relations when none is in fact present, especially when the original
relation is weak, as in.

x<-rnorm(20)
y<-0.01*x + rnorm(20)
plot(y ,residuals(lm(y~x)))

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
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