Twelve homeowners are selected randomly to participate in an experiment with
a plant nursery. Each homeowner is asked to select four fairly identical
areas in his yard and to plant four different types of grasses, one in each area.
Usage
data(grass)
Arguments
Format
A data frame with 48 observations on the following 3 variables.
judge
a numeric vector
trt
a factor with levels t1t2t3t4
evaluation
a numeric vector
Details
Each of the 12 blocks consists of four fairly identical plots of land,
each receiving care of approximately the same degree of skill because the
four plots are presumably cared for by the same homeowern.