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When I run a mutiple regression on 3 independent variables(2 dummy variables with multiple levels each and a metric variable).

In my result only few levels of a dummy variable are significant. The result of the levels for the same dummy variable are insignifcant.

How do I interpret it? Is the whole variable with multiple levels inisignificant or do the rest of the levels exhbit the base category behaviour?

Thanks

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I cannot make a comment (as i'm new to this forum). This can help you : Significance of dummy variables in regression

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    $\begingroup$ I wonder if you may be confusing dummy variable (typically a synonym for 0/1-coded indicator variable), with categorical variable. Dummy variables genneraly have exactly two levels. There are alternative ways and analytic reasons to code nominal/dichotomous/binary variables than 0/1, but that's usually the simplest. $\endgroup$ – Alexis May 15 '14 at 14:29

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