Date:         Thu, 15 Sep 2005 15:29:51 -0700
Reply-To:     Matthew Boswell <mjboswell@yahoo.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Matthew Boswell <mjboswell@yahoo.com>
Subject:      Counting the first instance of a value
Content-Type: text/plain; charset=iso-8859-1

I have the following data:


Class     ID
A         10
B         11
B         10
C         12
A         13


Where ID is unique to each case and it is possible
that a case might be in more than one class.  We were
trying to get a total count of the case, without
counting duplicates (i.e. ID 10 would be counted twice
above).  Is there a syntax option to just count the
first instance of a value when running an analysis
(frequencies in this case?).

Thanks!

MB