Re: st:how to create yearly lag in monthly data?

["Michael S. Hanson" <mshanson@mac.com>]

On May 2, 2006, at 2:24 PM, Badri wrote:

> Dear Stata users and experts,
> I'm dealing with a monthly data for a few years.
> Let me denote month no., by m and year no., by y.  What I need to do
> is to generate a variable B{m,y}=A{m,y-1}. A is a variable that is
> already in the dataset.
>
> This sounded quite simple to me till I tried a lot in vain.
>
> Could anyone give a solution for this simple problem?
	Assuming your data are -tsset- at a monthly frequency, you can use  
the lag operator:  L12.a will give you the 12-month (i.e. one-year)  
lag of the variable 'a'.  Additional information is available in [U]  
11.4.3, or (in Stata 9.2) type -hsearch lag operator-.  HTH.

                                        -- Mike


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