[R] multiple regressions on columns

[Greg Snow]

The add1 function might be what you want, there is also addterm in the MASS package and the leaps package can do some things along this line (plus more).

But before doing this, you may want to ask yourself what question you are really trying to answer, then explore if this answers that question or not.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of GOUACHE David
> Sent: Tuesday, February 24, 2009 10:13 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] multiple regressions on columns
> 
> R-helpers,
> 
> A quick question regarding my wanting to run multiple regressions
> without writing a loop.
> Looking at a previous discussion :
> http://tolstoy.newcastle.edu.au/R/e2/help/07/02/9740.html
> 
> my objective is to do the "opposite", i.e. instead of having the same
> independent variable and testing it against multiple dependent
> variables, my goal is to test multiple independent variables against
> the same dependent variable.
> 
> Using the iris dataset:
> 
> iris4 <- as.matrix(iris[,-c(1,5)])
> summary(lm(iris4 ~ Sepal.Length, iris))
> 
> what I would have liked is to do the following :
> 
> summary(lm(Sepal.Length ~ iris4, iris))
> 
> and obtain the results from 3 separate regressions, as above, instead
> of one multiple regression...
> 
> Any clues ?
> 
> Tanks in advance
> 
> David Gouache
> ARVALIS - Institut du végétal
> Station de La Minière
> 78280 Guyancourt
> Tel: 01.30.12.96.22 / Port: 06.86.08.94.32
> 
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