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# Re: st: Focusing on a particular age group in data set

 From Nick Cox <[email protected]> To [email protected] Subject Re: st: Focusing on a particular age group in data set Date Sun, 10 Apr 2011 18:22:24 +0100

```In addition, note that this is an FAQ

FAQ     . . Creating variables recording whether any or all possess some char.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
2/03    How do I create a variable recording whether any
members of a group (or all members of a group)
possess some characteristic?
http://www.stata.com/support/faqs/data/anyall.html

As -egen, max()- will take an expression for argument, the code can be
trimmed to something like

bysort householdid: egen hfem45 = max(sex==female & age <=45)
keep if hfem45

Nick

Fernando Rios Avila
==============

I think your best option is first to identify those households, and then use
that identification for the subsequent analysis.
To identify you could:
Gen fem45=0
Replace fem45=1 if sex==female & age <=45
Bysort householdid: egen hfem45=max(fem45)

That should identify in your household has any female 45 years old or
younger

On Sun, Apr 10, 2011 at 6:01 PM, Brendan Halpin <[email protected]> wrote:

> If you're working with a single wave, something like the following
> should work:
>
> . use qindresp
> . sort qhid qpno
> . gen femvalid = qage<=45 & qage>0 & qsex==2
> . by qhid: egen hhdvalid = max(femvalid)
> . keep if hhdvalid
>
> You should be able to generalise it for other structures (i.e., other
> waves, multiple waves).

Hassan Talal

I am trying to determine the socio-economic factors behind fertility using
British Household Panel Survey. I want to restrict the age group of female I
will be focusing on to maximum 45 years. As I am dealing with households, so
I will be analysing only those households which have <45 years old females.
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