[R] for loop; lm() regressions; list of vectors

[David Winsemius]

On Mar 30, 2010, at 12:42 PM, Driss Agramelal wrote:

> ##  Hello everyone,
> ##
> ##  I am trying to execute 150 times a lm regression using the 'for'  
> loop,
> with 150 vectors for y,
> ##
> ##  and always the same vector for x.
> ##
> ##  I have an object with 150 elements named "a",
> ##
> ##  and a vector of 60 values named "b".
> ##
> ##  Each element in "a" has 60 values plus a header.
> ##
> ##  When I type:
>
> r <- lm(i ~ b)
>
> for(i in a) print(r)
>
>

Try instead something like this untested modification:

  for(i in seq_along(a)) print(r <- lm(a[i] ~ b) )


>
> ##  I get 150 times the lm results of the first element of "a"  
> regressed
> with "b",
> ##
> ##  whereas I would like to have 150 different regression results  
> from each
> element in "a"...
> ##
> ##  Can someone please help me with the syntax of my loop please?
> ##
> ##  Many Thanks,
> ##
> ##  Driss Agramelal
> ##
> ##  Switzerland
> ##
>
> 	[[alternative HTML version deleted]]
>
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David Winsemius, MD
West Hartford, CT