xmp12.02 {Devore5} | R Documentation |
The xmp12.02
data frame has 19 rows and 2 columns.
This data frame contains the following columns:
These data are from an observational study of the mean crown dieback, a measure of the growth retardation in sugar maples, and the soil pH.
Devore, J. L. (2000) Probability and Statistics for Engineering and the Sciences (5th ed), Duxbury
(1995) ``Relationships among crown condition, growth, and stand nutrition in seven northern Vermont sugarbushes'', Canadian Journal of Forest Research, 386397
data(xmp12.02) plot(dieback ~ soil.pH, data = xmp12.02, xlab = "soil pH", ylab = "mean crown dieback (%)", main = "Data from Example 12.2, page 491") fm1 <- lm(dieback ~ soil.pH, data = xmp12.02) abline(fm1) summary(fm1) opar <- par(mfrow = c(2,2)) plot(fm1) par(opar)