Hi, I am looking for a model and an open source software that can help me predict the effect of a categorical variable (e.g. race or gender) on one continuous outcome measured at three levels (e.g. mortality rate 1, mortality rate 2, mortality 3). I saw somewhere that this can be achieved with multilevel multiple regression analysis, however, beside this method, are there others? What open source software can I use to achieve this? Thanks in anticipation.

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