heplots (version 1.3-8)

# RootStock: Growth of Apple Trees from Different Root Stocks

## Description

In a classic experiment carried out from 1918 to 1934, growth of apple trees of six different rootstocks were compared on four measures of size.

## Usage

`data(RootStock)`

## Format

A data frame with 48 observations on the following 5 variables.

`rootstock`

a factor with levels `1` `2` `3` `4` `5` `6`

`girth4`

a numeric vector: trunk girth at 4 years (mm x 100)

`ext4`

a numeric vector: extension growth at 4 years (m)

`girth15`

a numeric vector: trunk girth at 15 years (mm x 100)

`weight15`

a numeric vector: weight of tree above ground at 15 years (lb x 1000)

## Details

This is a balanced, one-way MANOVA design, with n=8 trees for each rootstock.

## References

Rencher, A. C. (1995). Methods of Multivariate Analysis. New York: Wiley, Table 6.2

## Examples

```# NOT RUN {
data(RootStock)
## maybe str(RootStock) ; plot(RootStock) ...
root.mod <- lm(cbind(girth4, ext4, girth15, weight15) ~ rootstock, data=RootStock)
Anova(root.mod)

pairs(root.mod)

# test two orthogonal contrasts among the rootstocks
hyp <- matrix(c(2,-1,-1,-1,-1,2,  1, 0,0,0,0,-1), 2, 6, byrow=TRUE)
linearHypothesis(root.mod, hyp)
heplot(root.mod, hypotheses=list(Contrasts=hyp, C1=hyp[1,], C2=hyp[2,]))

heplot1d(root.mod, hypotheses=list(Contrasts=hyp, C1=hyp[1,], C2=hyp[2,]))

# }
```