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Date:         Thu, 31 Oct 2002 18:28:06 -0500
Reply-To:     Art@DrKendall.org
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         "Arthur J. Kendall" <Arthur.Kendall@VERIZON.NET>
Subject:      Re: Why does (missing value) multiplied by zero = zero?
Comments: To: Andrew Fenyo <A.J.Fenyo@ukc.ac.uk>
Content-Type: text/plain; charset=us-ascii; format=flowed

I assume you are talking about the 3rd and 9th lines anything * zero = zero

also note that you will get different results if you put an execute. before declaring missing values for atype and btype.

Hope this helps.

Art Art@DrKendall.org Social Research Consultants University Park, MD USA

Andrew Fenyo wrote:

>Folks, > >I have been tearing my hair out, but I cannot see what I am doing wrong! > >I have a variable Q and a category TYPE. I need to create two new >variables (QA and QB) which take the value of Q or MISSING depending >on TYPE. It works fine EXCEPT when Q is zero: then I get both QA and QB set >to zero. > >I have probably overlooked something very simple, but any suggestions would >be most welcome. > >Here is a sample and the syntax: > >DATA LIST LIST /TYPE Q. >BEGIN DATA >1 25 >1 2 >1 0 >1 6 >1 17 >2 6 >2 26 >2 9999 >2 0 >2 18 >END DATA. >LIST. >MISSING VALUES Q (9999). >COMPUTE ATYPE=2-TYPE. >COMPUTE BTYPE=1-ATYPE. >MISSING VALUES ATYPE BTYPE (0). >LIST. >DO IF MISSING (Q). >COMPUTE QA=-9. >COMPUTE QB=-9. >ELSE. >COMPUTE QA=Q*ATYPE. >COMPUTE QB=Q*BTYPE. >END IF. >MISSING VALUES QA QB (-9). >LIST. > >============================== >Andrew Fenyo, Senior Computing Officer >Personal Social Services Research Unit >University of Kent, Canterbury, CT2 7NF >Voice: 01227 827610 Fax: 01227 827038 >PSSRU: http://www.ukc.ac.uk/PSSRU > > >


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