Currently, I am working on a study and I want to identify the correlation of my two variables (Workload perception and Stress Appraisal). I don't have SPSS so I'm using excel in my computation. However, I'm a bit confused because the two scales don't have similar number of items. The first is unidimensional with 13 items and the other one is multidimensional which is consisted of 7 subscales with 4 items respectively. Both of them are a 5-point likert scale. I know that I need to correlate the unidimensional scale to each subscale of the multidimensional scale but I'm not sure if it will lead to a reasonable result considering that scores from a 13-item scale will be correlated to a 4-item subscale. Thanks in advance!
Hello Floren,
If you're convinced that the second measure is multidimensional, then the correlations would be more meaningful if they were by subscale for the second measure rather than by total. If you wanted to be more confident that the respective scores were of interval strength, you could either: (a) use factor scores instead of summated scores; or (b) create respective (sub)scale scores via polytomous IRT modeling.
Good luck with your work!
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