[R] MA / RMA / Type II regression?
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Fri Feb 4 17:50:11 CET 2000
"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.
y<-0.01*x + rnorm(20)
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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