I am doing a study on the influence of education quality on perceived service quality of graduates. I collected data from three sets of respondents (graduate employees, employers and consumers of services). Whats the best method or technique I can apply to analyse the three sets of data to actualise my research objective?
It sounds like you have a linerar IV and 3 groups to predict your DV. In that case, I would recommend linear regression, in two steps. First create two "dummy variables" to represent your three groups, and run a regression while controlling for your IV, to test whether there are differences in between the three groups after controlling for the IV.
Second, create two interaction terms by multiplying each dummy variable by the IV and adding these two new variables to the previous regression. This will test whether the relationship between the IV and the DV is the same in each group (i.e., whether there are interaction effects).
A good source on this kind of analysis is Hardy, Regression With Dummy Variables (a "little green book" from Sage).
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