I'm comparing an independent variable of "ethical consumerism" with other variables. I used a pre-existing measurement scale, which divided ethical consumerism into three subcategories. I'd rather analyze the whole concept of ethical consumerism with the other variables instead of these subcategories separately. I tried creating index variables for the subcategories but one of them displayed inadequate values for further analysis, so I would be left with only two subcategories. Is it recommendable to move forward with the two remaining categories or ido I have an option of moving on with the whole concept of ethical consumerism? In other words, are the index variables my best option?
I guess, you mean "dummy" variables when you say "index" variables.
Your question has no specific answer. It depends on what you want to do with them.
Scale, index, dummy what ever you want to create can be created using SPSS.
If you want to create a single index variable, you should assess whether all of the relevant items form a scale. In SPSS, this can be done by calculating Cronbach's alpha. If you get a low value of alpha (less that .8), you should examine the data using exploratory factor analysis.
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