How do I build a design matrix/cell for mvregress (multiple dependent variables) with categorical variables (binary)

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Kim 2018-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/414302-how-do-i-build-a-design-matrix-cell-for-mvregress-multiple-dependent-variables-with-categorical-va

I am trying to build a multivariate regression model with two continuous dependent variables and one categorical (binary) predictor. If I treat the predictor as if it was continuous I get ridiculous coefficient estimates, but I can't figure out how to create dummy variables within the cell that mvregress wants as its predictor. Any help gratefully received! Thanks