Hi all!
As promised, I contacted Dr. Clements to get the answers to questions I wasn't sure about that were asked during tonight's review session.
1. Sobel's Test is reported with the symbol z prime. That is, use a lowercase, italicized z with a tick mark superscripted above it. (If I could get the blog to show it, I would.) If you don't understand from my description, you can see the article that Dr. Clements suggested you look at for an example of writing up mediated models found in an earlier post on the blog.
2. Always, always, always use 2-tailed tests of significance.
3. You do NOT have to include ANY figures for the moderated/mediated models homework. However, IF you do choose to include them, make sure they are formatted according to APA format.
4. Finally, we come to centering. This is important for one of the methods for testing moderated models. If you choose to test it using the method that requires an interaction term, you need to center the continuous predictor variable. Make sure you do this before creating the interaction term. Otherwise, you'll have collinearity issues.
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4 comments:
Thank you Justin this is helpful!!!
Thank you! Also, for the write up, do we report the statistics for the predictor and the mediator from step three as well as the overall models stats? If not, which ones are appropriate to report?
Is the tick mark an apostrophe?
Yes, tick mark = '
In the write up of the moderated model, you must interpret the interaction term in the context of the contributing main effects. For this homework, either the betas from the first step or from the second step will be considered as correct, and we can talk about the pros and cons of reporting either and both.
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