Last data update: 2014.03.03
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R: Fertilizer Data
Fertilizer | R Documentation |
Fertilizer Data
Description
A small data set on the use of fertilizer (x) in relation to the amount of
grain (y1) and straw (y2) produced.
Usage
data(Fertilizer)
Format
A data frame with 8 observations on the following 3 variables.
grain amount of grain produced
straw amount of straw produced
fertilizer amount of fertilizer applied
Details
The first observation is an obvious outlier and influential observation.
Source
Anderson, T. W. (1984).
An Introduction to Multivariate Statistical Analysis,
New York: Wiley, p. 369.
References
Hossain, A. and Naik, D. N. (1989).
Detection of influential observations in multivariate regression.
Journal of Applied Statistics, 16 (1), 25-37.
Examples
data(Fertilizer)
# simple plots
plot(Fertilizer, col=c('red', rep("blue",7)), cex=c(2,rep(1.2,7)), pch=as.character(1:8))
biplot(prcomp(Fertilizer))
#fit mlm
mod <- lm(cbind(grain, straw) ~ fertilizer, data=Fertilizer)
Anova(mod)
# influence plots (m=1)
influencePlot(mod)
influencePlot(mod, type='LR')
influencePlot(mod, type='stres')
Results
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