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# The data set in Devore6 is slightly different, but the Devore6 package
# has been archived, so we'll substitute the similar one from Devore 7 here.
require(Devore7); data(xmp13.13, package='Devore7')
concrete <- data.frame(
limestone=xmp13.13$x1, water=xmp13.13$x2, strength=xmp13.13$strength)
concrete.lm1 <- lm(strength ~ limestone * water, concrete)
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