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.
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.
data(grass)
A data.frame with 48 observations on the following 3 variables.
@details
judge judge
trt a factor with levels t1, t2, t3, and t4
evaluation evaluation
Book: Practical Nonparametrics Statistics, pag 372.
Practical Nonparametrics Statistics. W.J. Conover, 1999
#> 'data.frame': 48 obs. of 3 variables: #> $ judge : int 1 2 3 4 5 6 7 8 9 10 ... #> $ trt : Factor w/ 4 levels "t1","t2","t3",..: 1 1 1 1 1 1 1 1 1 1 ... #> $ evaluation: num 4 4 3 3 4 2 1 2 3.5 4 ...