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Re: st: using loops in collapse command


From   Jocelyn Michael <michaeljocelyn31@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: using loops in collapse command
Date   Mon, 2 Apr 2012 11:46:17 -0400

Thank you.

J.

On Mon, Apr 2, 2012 at 10:45 AM, ming li <limingnancy.pku@gmail.com> wrote:
> 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.
>> *
>> *   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/
>
>
>
>
> --
> 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/

*
*   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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