Re: st: Creating a Variable for the average by subgroup for a panel dataset

[Jeph Herrin <stata@spandrel.net>]

Making some assumptions about your variable names, this should work:


 bysort sex agecat state : egen avgincome=mean(income)


Jeph





On 12/28/2012 8:43 AM, gianluca manzi wrote:
> Dear Statalist,
>
> How can I calculate the average of a variable by the subgroup of
> several other variables?
>
> I have a panel dataset of individuals incomes, the state they live in,
> their ages and genders.  I want to calculate the average income for
> individual i at time period t based on these characteristics and
> create a variable for this (to use as a "reference income" individual
> i in time t will compare his income to).
>
> So (say) I want to create a variable that will calculate the average
> income for all women aged 20-30 who live in California;  the average
> income for all men aged 20-30 who live in California;  the average
> income for all women aged 30-40 who live in California;  the average
> income for all men aged 30-40 who live in California;  the average
> income for all women aged 20-30 who live in Texas etc etc.
>
> The purpose of this is to create a "reference income" which individual
> i in period t will compare his/her income to. So if the individual is
> woman, aged 22, who lives in California, she'll compare her income to
> the average income of 20-30 year old women who live in California. How
> do I create this variable?
>
> Thank you!
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