A data frame with 32 observations on the following 5 variables.
treatments
a factor with levels ABCD
squares
a factor with levels 12
rows
a factor with levels 1234
columns
a factor with levels 1234
response
a numeric vector
References
SAMPAIO, I. B. M. Estatistica aplicada a experimentacao animal. 3nd Edition. Belo Horizonte: Editora FEPMVZ, Fundacao de Ensino e Pesquisa em Medicina Veterinaria e Zootecnia, 2010. 264p.