lsmeans (version 2.27-62)

MOats: Oats data in multivariate form

Description

This is the Oats dataset provided in the nlme package, but it is rearranged as one multivariate observation per plot.

Usage

data(MOats)

Format

A data frame with 18 observations on the following 3 variables.

Variety

a factor with levels Golden Rain, Marvellous, Victory

Block

an ordered factor with levels VI < V < III < IV < II < I

yield

a matrix with 4 columns, giving the yields with nitrogen concentrations of 0, .2, .4, and .6.

Details

These data arise from a split-plot experiment reported by Yates (1935) and used as an example in Pinheiro and Bates (2000) and other texts. Six blocks were divided into three whole plots, randomly assigned to the three varieties of oats. The whole plots were each divided into 4 split plots and randomized to the four concentrations of nitrogen.

References

Pinheiro, J. C. and Bates D. M. (2000) Mixed-Effects Models in S and S-PLUS, Springer, New York. (Appendix A.15)

Yates, F. (1935) Complex experiments, Journal of the Royal Statistical Society Suppl. 2, 181-247

Examples

# NOT RUN {
require(lsmeans)
MOats.lm <- lm (yield ~ Block + Variety, data = MOats)
MOats.rg <- ref.grid (MOats.lm, mult.name = "nitro")
lsmeans(MOats.rg, ~ nitro | Variety)
# }