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I am trying to run a Bayesian regression in JASP 0.9.0.0. but the program does not allow adding categorical variables to my covariates -- only continuous ones. Anyone knows why?
It is because the coefficients for categorical variables require a different prior structure, and this is still being sorted out in the BAS package. What you could do is use the Bayesian "ANOVA" (really a linear mixed effect model) and define an ANCOVA.