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Re: st: How to calculate weighted mean


From   "Thomas, Anthony" <anthony_h_thomas@brown.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to calculate weighted mean
Date   Thu, 5 Dec 2013 13:36:47 -0500

Yep, egen can have multiple variables in the "by" option. They should
be separated with a space though (not a comma as in the example
above). Also options are separated by spaces as well, not commas.

Anthony

On Thu, Dec 5, 2013 at 1:31 PM, Xixi Lin <winnielxx@gmail.com> wrote:
> Hi Nick,
>
> Thanks for pointing this out. Btw, is it possible for egen to both run
> by country and by period? My code seems to be not working that way.
>
> Best,
> Xixi Lin
>
> On Thu, Dec 5, 2013 at 1:12 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> That is a user-written program from SSC. You need to install it using
>>
>> . ssc inst _gwtmean
>>
>>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 5 December 2013 18:07, Xixi Lin <winnielxx@gmail.com> wrote:
>>> Hi,
>>>
>>> I am trying to calculate weighted average return by country and by
>>> period. Here is my code:
>>> egen capweight_return = wtmean(Return_lead1), weight(Market_Cap),
>>> by(Country, Period)
>>>
>>> But the stata says "unknown egen function wtmean()", does anyone knows
>>> how to fix that?
>>>
>>> Thanks.
>>>
>>> Best,
>>> Xixi Lin
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