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I have two variables A and B.

A is of nominal scale type and B is of interval scale type.

A is the brand of the car a person drives. And B is the person's mean salary per year.

What method would you recommend to measure the correlation?

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    $\begingroup$ Please add more details. Calculating correlations is only the first step, so the question depends on what are you going to do with these correlations. $\endgroup$ – mpiktas Dec 20 '11 at 10:14
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Usually eta or its shrunk version omega are used as a measure of strength of relationship between a nominal and an interval variables. See here for short reference. You might consider taking logarithm of your interval variable income before computation.

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  • $\begingroup$ that's the hint I needed! $\endgroup$ – Raffael Dec 20 '11 at 10:51

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