Fertilizer | R Documentation |
A small data set on the use of fertilizer (x) in relation to the amount of grain (y1) and straw (y2) produced.
A data frame with 8 observations on the following 3 variables.
amount of grain produced
amount of straw produced
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.
data(Fertilizer) # simple plots plot(Fertilizer, col=c('red', rep("blue",7)), cex=c(2,rep(1.2,7)), pch=as.character(1:8)) # A biplot shows the data in 2D. It gives another view of how case 1 stands out in data space biplot(prcomp(Fertilizer)) # fit the 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')
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.