Date: Fri, 11 Mar 2011 08:38:28 -0800
Reply-To: apb218 <firstname.lastname@example.org>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: apb218 <email@example.com>
Subject: Percentiles and Ties
Content-Type: text/plain; charset=us-ascii
I have a client who wants me to report on the amount spent by the Top X
Percentile of Customers in each of the last three years.
I tried using the Percentiles within the Rank command, but I learned that
there are a lot of ties in my data, and none of the options for handling
ties (mean, high, low, sequential) seems to handle them in what I would
consider the right way.
The problem is that each seems to produces a "lumpy" distribution; none of
them seems to give me exactly 10% of customers in each decile because (I
think) they will all assign people with the same revenue the same rank and
therefore the same percentile.
My preference would be a method that assigns some of the ties to the higher
percentile and some to the lower percentile at random; the point is to
finish in a place where exactly 10% of the cases are in each decile.
Is there another way?
View this message in context: http://spssx-discussion.1045642.n5.nabble.com/Percentiles-and-Ties-tp3425366p3425366.html
Sent from the SPSSX Discussion mailing list archive at Nabble.com.
To manage your subscription to SPSSX-L, send a message to
LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
For a list of commands to manage subscriptions, send the command