RELIABILITY uses listwise deletion of cases, even across multiple scales

Troubleshooting

Problem

I have used the SPSS RELIABILITY procedure to perform an item analysis. I used three /SCALE subcommands to assign the 30 items in my variable list to three scales of 10 items each, as follows: RELIABILITY /VARIABLES=itema1 to itema10 itemb1 to itemb10 itemc1 to itemc10 /FORMAT=NOLABELS /SCALE(Ascale)=itema1 to itema10 /SCALE(Bscale)=itemb1 to itemb10 /SCALE(Cscale)=itemc1 to itemc10 /MODEL=ALPHA /STATISTICS=DESCRIPTIVE SCALE CORR /SUMMARY=TOTAL . I have complete data for all cases on the Ascale items, but there is some missing data among the Bscale and Cscale items. The sample size reported in analyses for all three scales equaled the number of cases with complete data on all 30 items. The procedure gives me a separate reliability analysis for each scale. I expected each of these analyses to use all of the cases that had complete data for the scale. Is there a way to request RELIABILITY to delete cases on a scale-wise basis?

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Historical Number

33701

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Document Information

Modified date:
16 April 2020

UID

swg21475254

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