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Chapter 3 Exercise 15
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significant.variables.single <- c("zn", "indus", "chas", "nox", "rm", "age", "dis", "rad", "tax", "ptratio", "black", "lstat", "medv")
significant.variables.multiple <- c("zn", "indus", "chas", "nox", "rm", "age", "dis", "rad", "tax", "ptratio", "black", "lstat", "medv")
significant.variables.cubic <- c("zn", "indus", "nox", "rm", "age", "dis", "rad", "tax", "ptratio", "black", "lstat", "medv") # not for chas!