foreach loop, stata equivalent

Le lundi 18 f?vrier 2013 ? 13:48 +0100, Jamora, Nelissa a ?crit :

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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