Hello,
I have this experimental group, I gave them a questionnaire with 15 items about motivation with two subscales (10 about autonomous motivation, 5 controlled motivation) as a pretest and posttest before and after the treatment. Apart from reporting the overall results, can I also compare the subscales, ie, pretest autonomous motivation with posttest autonomous motivation?
Thanks a lot in advance for taking time for this.
Is it the same test? What are your research questions, for example, are you interested in comparing groups (and if so were the groups decided randomly)? Are you interested in the individual items, the two subscales, etc.?
Daniel Wright, thank you for the response. And yes it is the same test. Actually I am interested in comparing the groups, but for future use, I also would like to compare the subscales of it. And the groups were decided over convenient sampling.
Thank you very much once again.
I don't see any reason why you can't report similar tests for both the full scale and the two sub-scales. In particular, you might have a stronger effect in one of the sub-scales.
But note that the difference in the number of items in the two sub-scales needs to be taken into account. One simple way to do this would be standardize each of them (Z-scores) before combining them.
If you have a design with pretest and posttest, and you applied an instrument with two subscales, you can compare with a 2x2 analysis of variance the significance in each subscale, and if these differ between the groups.
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