Date:         Wed, 24 Aug 2011 15:08:12 +0100
Reply-To:     Muir Houston <Muir.Houston@GLASGOW.AC.UK>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Muir Houston <Muir.Houston@GLASGOW.AC.UK>
Subject:      missing value issue
Content-Type: multipart/alternative;

Hi Listers,
I have a scale of 28 items which correspond to 7 motivational constructs - now I run the syntax below:
COMPUTE IMTK=SUM(Motiv_2, Motiv_9, Motiv_16, Motiv_23).
COMPUTE IMTA=SUM(Motiv_6, Motiv_13, Motiv_20, Motiv_27).
COMPUTE IMTES=SUM(Motiv_4, Motiv_11, Motiv_18, Motiv_25).
COMPUTE EMID=SUM(Motiv_3, Motiv_10, Motiv_17, Motiv_24).
COMPUTE EMIN=SUM(Motiv_7, Motiv_14, Motiv_21, Motiv_28).
COMPUTE EMER=SUM(Motiv_1, Motiv_8, Motiv_15, Motiv_22).
COMPUTE AMOT=SUM(Motiv_5, Motiv_12, Motiv_19, Motiv_26).
EXECUTE.
 
and I find that if one of the item values is missing then the construct is also missing - two questions - how would I get the syntax to give me a sum of all valid scores, and secondly what approaches would you suggest to deal with missing data in this instance?
 
thanks
Muir
 
Dr Muir Houston
Social Justice, Place and Lifelong Education Research
School of Education
College of Social Sciences
University of Glasgow
0141-330-4699
 
R3L+ Project - Adult education in the light of the European Quality
Strategy
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