Date:         Fri, 9 Sep 2005 14:00:47 -0700
Reply-To:     Chao Yawo <yawo1964@yahoo.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Chao Yawo <yawo1964@yahoo.com>
Subject:      Stratified Sampling
Comments: To: SAS-L <SAS-L@LISTSERV.UGA.EDU>,
          StataList <statalist@hsphsun2.harvard.edu>
Content-Type: text/plain; charset=iso-8859-1

Hi,

I am teaching a sophomore social statistics course.
I've been covering sampling, especially stratified
sampling this week.

The students need some assistance in explaining the
weighting procedures associated with disproportionate
stratified sampling.  How can I demonstrate this in a
class with a concrete example.

Also, is there any guidelines as to how to oversample
a particular stratum?  Assuming i have 2 groups (males
are 20% and Females=80%). If I am drawing a sample of
100 students - it means I would end up with 20 males
and 80 females.  If i need to oversample the males,
what values should i chose - 30, 40, 50? - is the
choice really arbitrary or is guided by theory or
calculations?

I will appreciate your thoughts on this.

Regards, YC




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