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...e predictors contain a column of ones representing the intercept. Random effects are coded in the predictor matrix as a `2'. The class variable (only one is allowed) is coded by a `-2'." and "R> pred["popular", ] <- c(0, -2, 0, 2, 1, 2, 0) R> imp <- mice(popmis, meth = c("", "", "2l.norm", "", "", + "", ""), pred = pred, maxit = 1, seed = 71152)" My questions are: 1. In the above example, only 1 variable have missing values, so in the code, only one "2l.norm" was sp...