R help - Mar 2014 - Simple loop question

Hi all,

I'm trying to find out what is the equivalent in R for the following Stata
code:

Let's say I have the variables: a1, a2, a3, a4, a5

forvalues i = 1(1)5 {
    summary a`i'
}

That is, I want to know how to loop through variables in R.

Thank you in advance,

Luana

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