Chapter 3 Exercise 14
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set.seed(1)
x1 <- runif(100)
x2 <- 0.5 * x1 + rnorm(100)/10
y <- 2 + 2 * x1 + 0.3 * x2 + rnorm(100)
# ...
x1 <- c(x1, 0.1)
x2 <- c(x2, 0.8)
y <- c(y, 6)
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