MOats {lsmeans} | R Documentation

## 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.

### Source

The dataset `Oats` in the nlme package.

### 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

    require(lsmeans)
    MOats.lm <- lm (yield ~ Block + Variety, data = MOats)
    MOats.rg <- ref.grid (MOats.lm, mult.name = "nitro")
    lsmeans(MOats.rg, ~ nitro | Variety)

[Package lsmeans version 2.25 Index]