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Re: st: using loops in collapse command


From   Alberto Dorantes <alberto.dorantes@finanzastec.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: using loops in collapse command
Date   Mon, 2 Apr 2012 10:03:23 -0500

Hi Michael.
You can install the egenmore function first using findit egenmore.

Then, you can type:

egen gm=gmean(value1), by(id)
egen nn=count(value1), by(id)
gen prod=gm^(nn)

I hope this help...

Alberto.

2012/4/2 Jocelyn Michael <michaeljocelyn31@gmail.com>:
> I am a new stata user and have been trying to write a loop to accomplish a task.
>
> My data looks like this:
>
>
> id                 Year               Value 1
> A               Jan1991             0.92
> A               Feb1991             0.93
> A               Mar1991             0.24
> A               APr1991             0.83
> ..
> ..
> B               Jan1991             0.67
> B               Feb1991             0.45
> ..
>
> What I am trying to achieve is to write a loop that multiplies value1
> for each id and returns one number for each year - sort of like a
> collapse command but instead of the sum, I want the product. That is
> for A for 1991, (0.92*0.93*0.24*0.83).
>
> Any help is greatly appreciated.
>
> JM.
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