rootstock: Apple of Different Rootstock

In ACSWR: A Companion Package for the Book "A Course in Statistics with R"

Description

The goal is to test if the mean vector of the four variables is same across 6 stratas of the experiment.

Usage

data(rootstock)

Format

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

rootstock

Six different rootstocks

y1

trunk girth at 4 years

y2

extension growth at 4 years

y3

trunk girth at 15 years

y4

weight of tree above ground at 15 years

References

Rencher, A.C. (2002). Methods of Multivariate Analysis, 2e. J. Wiley.

Examples

data(rootstock)
attach(rootstock)
rs <- rootstock[,1]
rs <- factor(rs,ordered=is.ordered(rs)) # Too important a step
root.manova <- manova(cbind(y1,y2,y3,y4)~rs)
summary(root.manova, test = "Wilks")

Example output

The following object is masked _by_ .GlobalEnv:

    rootstock

          Df   Wilks approx F num Df den Df    Pr(>F)    
rs         5 0.15401   4.9369     20  130.3 7.714e-09 ***
Residuals 42                                             
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

ACSWR documentation built on May 2, 2019, 6:53 a.m.