Many, many thanks, Fugue!! It worked very well with my data! I have over 25000 observations, and actually I just have (for now), 2 ethnicities as well! But in the future I will have at least 4 more and more observations. This query did not take too long to run in my machine (about 3 minutes), which is also windows-based but in mac (partition), so I assume that will take a bit longer with more ethnicity groups but it's fine! Thank you again!
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