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$\begingroup$ @rnorouzian This follow-up is exactly why I asked the questions in my comments to the original question. My answer provides the algebra and that will work no matter how many predictors you have. The other bit you need is an understanding of how categorical variables are expanded into a set of numeric contrasts, then it's just repeating that algebra with those numeric contrasts. If nb_wght is just 0's and 1's, it's already equivalent to a two-level categorical variable coded with dummy/treatment contrasts. $\endgroup$

Livius
– Livius

2021-02-06 11:52:38 +00:00
Commented Feb 6, 2021 at 11:52

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