Date: Wed, 1 Dec 2010 06:04:15 -0800
Reply-To: Bruce Weaver <email@example.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Bruce Weaver <firstname.lastname@example.org>
Subject: Re: Remove cases in SPSS/PASW
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When merging, did you add cases (via ADD FILES), or add variables/columns
(via MATCH FILES)?
Re your desire to use only individuals who have data for all 3 time periods,
have you considered using multilevel modeling (via MIXED)? It would not be
bothered by the fact that people have varying numbers of time points to
contribute. (It requires a LONG file structure, such that each individual
has one row for each occasion of measurement.) The UCLA Computing website
has syntax for many of the examples in Singer & Willett's book "Applied
Longitudinal Data Analysis".
> Hi there, hope some of you can help. I am using SPSS/PASW
> I have a merged my data set from a longitudinal investigation of 2000
> users measured in 3 different times. 2008-2009 and 2010. Unfortunately
> there are several drop outs, some have answered only in 2008 and 2009,
> other in 2008 and 2010, and some all the three periodes.
> However how can I identify or only make use of the cases or individuals
> that have responded on all three times in the investigation? I have tried
> several different approaches in "Select cases" and "if condition is
> satisfied", but I only get strange samples. Can somebody help me?
"When all else fails, RTFM."
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