Date: Wed, 15 Feb 2006 07:34:28 -0600
Reply-To: "Peck, Jon" <peck@spss.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: "Peck, Jon" <peck@spss.com>
Subject: Re: Boxplots
Content-Type: text/plain; charset="utf-8"
While you could modify the data as described or hide the points and whiskers in a boxplot, this can be misleading. Boxplots are expected to show outliers and extremes, so hiding these suggests that there are none. Perhaps you could show the distribution information in some other way such as a range bar or high/low/close if you don't want to show outliers.
Regards,
Jon Peck
SPSS
-----Original Message-----
From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of Allan Reese (Cefas)
Sent: Wednesday, February 15, 2006 3:29 AM
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: Re: [SPSSX-L] Boxplots
I wrote to Andreas off-list asking *why* one would want shaved box&whiskers. In terms of producing them, one could transform the data so that values outside the box (ie outside the quartiles) were recoded to the quartile value. The syntax might be SORT, SPILT FILE, RANK, and IF. You can copy from preceding cases, so
IF (RANKX>.75) X = LAG(X)
deals with the top quartile. Is there a way to do the equivalent with the bottom quartile other than another (descending) sort and IF?
Allan
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