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Re: st: using loops in collapse command
From
ming li <[email protected]>
To
[email protected]
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 <[email protected]>
>
> 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：[email protected]
手机：(86)151-2007-8720
Nancy Li
Candidate for Bachelor of Finance,Yuanpei College, Peking University
Email:[email protected]
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/