roller {DAAG}

Lawn Roller Data

Description

The roller data frame has 10 rows and 2 columns. Different weights of roller were rolled over different parts of a lawn, and the depression was recorded.

Usage

roller

Format

This data frame contains the following columns:

weight

a numeric vector consisting of the roller weights

depression

the depth of the depression made in the grass under the roller

Source

Stewart, K.M., Van Toor, R.F., Crosbie, S.F. 1988. Control of grass grub (Coleoptera: Scarabaeidae) with rollers of different design. N.Z. Journal of Experimental Agriculture 16: 141-150.

Examples

plot(roller)
roller.lm <- lm(depression ~ weight, data = roller)
plot(roller.lm, which = 4)