xmp12.02 {Devore5}R Documentation

data from Example 12.2

Description

The xmp12.02 data frame has 19 rows and 2 columns.

Format

This data frame contains the following columns:

soil.pH
pH of the soil at the test site.
dieback
mean crown dieback at the test site (%).

Details

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.

Source

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, 386–397

Examples

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)