| 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)