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Is it useful to include (categorical) dummy-variables in a correlation and/or scatter matrix?
I thought it was only useful to include quantitative/numerical variables but not 100% sure about this.
Thanks for the help!
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There is discussion about that. Some people do it, I think it makes no sense whatsoever.
There are published articles that use this approach, but I prefer doing t-tests with dichotomous variables....
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