Tobias Muhlhofer wrote:

Hi!

I'm trying to do the following.

I have monthly a dataset with, among other things, "marketcap", and "return".

I want to multiply return by the marketcap of the previous month. How do I do this?

In STATA (which I have used frequently in the past) I would simply use an expression of the form

return[_n]*marketcap[_n-1]

I believe they call this relative subscripting. Is there something like this in R?

On a completely different note, are there books on R? I read the "Getting Started" notes, but, while helpful, I would need more than those.

Q 2.7 in the R faq (yes, there are many)!

Kjetil


Thanks, Toby

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--

Kjetil Halvorsen.

Peace is the most effective weapon of mass construction.
              --  Mahdi Elmandjra

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