Date:         Mon, 29 Jun 2009 15:39:00 +0200
Reply-To:     Spousta Jan <JSpousta@CSAS.CZ>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Spousta Jan <JSpousta@CSAS.CZ>
Subject:      Re: Binning data into 2 equal percentiles.
Comments: To: Mark Webb <targetlk@iafrica.com>
In-Reply-To:  A<4A48C33C.9070703@iafrica.com>
Content-Type: multipart/alternative;

Mark,
 
add a small random noise to the variable first, and then create bins. For example:
 
compute aux = original_variable + uniform(0.000001) .
 
...and base the bins on the variable aux.
 
HTH
 
Jan

________________________________

From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of Mark Webb
Sent: Monday, June 29, 2009 3:36 PM
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: Binning data into 2 equal percentiles.


This is offered in the Visual binning section but I need to modify this and would appreciate some advice.
The SPSS version states - 
If there are multiple identical values at a cutpoint, they will all go into the same interval; so the actual percentages may not always be exactly equal.

I want to have bins of 50% - and in situations where the [median] is shared by say 10% of the sample - the SPSS version gives a solution that is 40%:60%.

How can I allocate those records having the median randomly between the 2 bins ?

Regards-- 

Mark Webb

+27 21 786 4379
+27 72 199 1000
Skype - webbmark
targetlink@iafrica.com
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