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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 11:48:41 -0400

don't know how I missed this thread. Thank you very much.

J.

On Mon, Apr 2, 2012 at 10:52 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> See also the thread started just one week ago by
>
> http://www.stata.com/statalist/archive/2012-03/msg01141.html
>
> On Mon, Apr 2, 2012 at 3:35 PM, Jocelyn Michael
> <michaeljocelyn31@gmail.com> wrote:
>> 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).
>
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