[R] loop with variable names

[Ista Zahn]

It's hard to imagine a situation where this makes sense, but of course
you can do it if you want. Perhaps

rhs <- unlist(sapply(1:(ncol(df)-1), function(x)
apply(combn(names(df)[-1], x), 2, paste, collapse = " + ")))

lapply(rhs, function(x) lm(as.formula(paste("y ~", x)), data = df))

--Ista
On Fri, Nov 4, 2016 at 12:53 PM, paolo brunori <paolo.brunori at uniba.it> wrote:
> Suppose I have the following data:
>
> y<-rnorm(10)
> age<-rnorm(10)
> sex<-rbinom(10,1, 0.5)
> edu<-round(runif(10, 1, 20))
> edu2<-edu^2
>
> df<-data.frame(y,age,sex,edu,edu2)
>
> I want to run a large number of models, for example:
>
> lm(y~age)
> lm(y~age+sex)
> lm(y~age+sex+edu)
> lm(y~age+sex+edu+edu2)
> lm(y~sex+edu2)
> lm(y~age+edu+edu2)
> ....
>
> But I would like to first define a list containing all possible sets of
> regressors, and then execute each one in a loop/lapply. Unfortunately I got
> lost in trying to paste variables' name in the formula with no result.
>
> many thanks in advance.
>
> paolo
>
>
>
> --
> Paolo Brunori
> Ricercatore in Economia Politica & Life Course Centre Fellow
> Dipartimento di Scienze Economiche - Università di Bari
> www.uniba.it/docenti/brunori-paolo
> www.equalchances.org
> www.lifecoursecentre.org.au
>
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