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Re: st: using loops in collapse command
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: using loops in collapse command
Date
Mon, 2 Apr 2012 16:10:55 +0100
The geometric mean is only usefully defined for strictly positive
values. If that is the case, then the solution at
http://www.stata.com/statalist/archive/2012-03/msg01142.html
is equivalent to this, requires no installed extras and is more direct.
Nick
On Mon, Apr 2, 2012 at 4:03 PM, Alberto Dorantes
<[email protected]> wrote:
> 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 <[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).
>>
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