Re: Random sample matched on variables

Posted by Martha Hewett on Nov 12, 2012; 4:04pm
URL: http://spssx-discussion.165.s1.nabble.com/Random-sample-matched-on-variables-tp5716152p5716157.html

Using propensity scores rather than matching on specific demographics is likely to produce less biased results.  For a start check this:

http://en.wikipedia.org/wiki/Propensity_score_matching




From:        Koen N <[hidden email]>
To:        [hidden email]
Date:        11/12/2012 09:58 AM
Subject:        Random sample matched on variables
Sent by:        "SPSSX(r) Discussion" <[hidden email]>

---

Dear more experienced than me SPSS users,

I'm currently working on a research project in which I've hit a wall. I have
three groups which I want to compare on a number of analysis. One of these
groups is much too large compared to the other groups. This much too large
group is a control group. The other two groups are comprised of a rare
demographic. As of such, I want to drop my control group of 65 down to 25-30
while matching them on certain demographic variables (namely age, IQ and
education). The other two groups don't differ significantly from one another
on the mean of these variables. My control group does differ sognificantly.
I want my control group sample to be within the same range of the means of
my other two groups.

Obviously (otherwise I wouldn't be posting), I am completely lost as to how
to do this. I assume I'll be using the syntax, but I am unsure what commands
I should be using. I've searched around and found some similar cases as
mine, except they wanted to take a random sample based on propensity scores
(which I don't believe works for me) or they wanted to take a sample out of
two groups (while I want a sample out of one).

If anyone could assist me, I would be very grateful. Thanks for your time!



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