How to use SPSS/Composite scores
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[edit] How to create composite scores in SPSS
This tutorial explains how to create composite scores in SPSS, using the compute function. You can either use syntax or the pull-down menus. Note that you can also create (regression-weighted) composite scores via exploratory factor analysis.
Before creating composite scores, you should also consider conducting exploratory factor analysis and/or analyses of internal consistency to help identify the extent to which the items you are wishing to combine are correlated with one another.
[edit] Exercises
- Student satisfaction
- Allen & Bennett Ch 2 (pp. 8-9) [1] | .sav | .sps
- Create a composite satisfaction score as the average of responses to these two items:
| 4 | I am enjoying my course |
| 5 | It is easy to get good grades in my course |
- Quality of maths and english teaching
Francis 6.1 (pp. 167) [2] | .sav
- Create composite scores for the:
- Quality of Maths Teaching (9 items)
- Quality of English Teaching (8 items)
- What is the correlation between these composite scores?
- Syntax
compute MathsTeaching = mean(maths1,maths2,maths4,maths5,maths6,maths7,maths8,maths9,maths10).
- computes a value for each participant, even if they have only one score
compute MathsTeaching = mean.3(maths1,maths2,maths4,maths5,maths6,maths7,maths8,maths9,maths10).
- computes a value for each participant, as long as they have three or more scores
- Pull-down menus
Go to Transform - Compute - Add name of new variable and create a formula, e.g,.
MathsTeaching | mean(maths1,maths2,maths4,maths5,maths6,maths7,maths8,maths9,maths10)
- computes a value for each participant, even if they have only one score
MathsTeaching | mean.3(maths1,maths2,maths4,maths5,maths6,maths7,maths8,maths9,maths10)
- computes a value for each participant, as long as they have three or more scores
[edit] References
- ↑ Allen, P. & Bennett, K. (2008). SPSS for the health and behavioural sciences. South Melbourne, Victoria, Australia: Thomson. | Companion site
- ↑ Francis, G. (2007). Introduction to SPSS for Windows: v. 15.0 and 14.0 with Notes for Studentware (5th ed.). Sydney: Pearson Education. | Support site
[edit] External links
- Creating Composite Scores in SPSS (wilderdom)
- Discussion thread (about using .x to specify the minimum number of input variables)
