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Date:         Thu, 31 Oct 2002 18:28:06 -0500
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 <>
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 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: > > >

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