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Re: st: using loops in collapse command


From   ming li <limingnancy.pku@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: using loops in collapse command
Date   Mon, 2 Apr 2012 22:45:26 +0800

hi Michael,
how about try this:

net install dm71.pkg
egen newwar=prod(value1), by(id)

for more options, just help prod after installation

Ming

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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--
李明
北京大学元培学院 2008级金融本科
邮箱:limingnancy.pku@gmail.com
手机:(86)151-2007-8720

Nancy Li
Candidate for Bachelor of Finance,Yuanpei College, Peking University
Email:limingnancy.pku@gmail.com
Cell:(86)151-2007-8720

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


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