[R] foreach loop, stata equivalent

[Milan Bouchet-Valat]

Le lundi 18 février 2013 à 13:48 +0100, Jamora, Nelissa a écrit :
> Hi! I'm a recent convert from Stata, so forgive my ignorance.
> 
>  
> 
> In Stata, I can write foreach loops (example below)
> 
>  
> 
> foreach var of varlist p1-p14 {
> 
> foreach y of varlist p15-p269 {
> 
>   reg `var' `y'
> 
> }
> 
> }
> 
>  
> 
> It's looping p1-p15, p1-p16...., p1-p269, p2-p15, p2-p16,... p2-p269,...
> variable pairs.
> 
>  
> 
> How can I write something similar in R? 
> 
> I 'tried' understanding the package.foreach but can't get it to work.
You do not need package foreach, which is intended at a completely
different problem.

R does not really have the syntactic equivalent of "varlist", but you
can easily do something like:
for(var in paste0("p", 1:14)) {
    for(y in paste0("p", 15:269))
        lm(yourData[[var]] ~ yourData[[y]])
}

provided that yourData is the data frame in which the p* variables are
stored.

There are probably more direct ways of doing the same thing and storing
the resulting lm objects in a list, but you did not state what you
intend to do with this enormous set of regressions...


Regards

> Thanks for any help
> 
> Nelissa
> 
> 
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