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..."MathAch", "MEANSES") head(MathAchieve) MathAchSchool <- read.table("mathachschool.txt") colnames(MathAchSchool) <- c("School", "Size", "Sector", "PRACAD", "DISCLIM", "HIMINTY", "MEANSES") MathScores <- merge(MathAchieve, MathAchSchool, by = "School") lm1 = lm(MathAch ~ SES + factor(Sector) , MathScores) X=model.matrix(MathAch ~ SES+factor(Sector) , MathScores) y=MathScores$MathAch tmp=MathScores tmp$y=y tmp$X=X lm1x = lm(y~X-1, tmp) plot(fitted(lm1), fitted(lm1x)) max(abs(...

Dear R users, I'm estimating a two-level regresion model but having difficuly in finding a good R syntax example. Let me use an example to explain what I'm doing. The dependent variable is math score (mathscore). Predictors are at two levels. At the student level, they are household income (hinc) and IQ (IQ). At the school level, there is a dummy variable indicating if the school is a