Description Usage Format Details Source References Examples
A small data set on the use of fertilizer (x) in relation to the amount of grain (y1) and straw (y2) produced.
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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
The first observation is an obvious outlier and influential observation.
Anderson, T. W. (1984). An Introduction to Multivariate Statistical Analysis, New York: Wiley, p. 369.
Hossain, A. and Naik, D. N. (1989). Detection of influential observations in multivariate regression. Journal of Applied Statistics, 16 (1), 25-37.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | 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')
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