A random sample of 15 countries' research and development investments for
the years 2002 and 2003 is taken and the results in millions of euros are
A data frame with 15 observations on the following 3 variables:
a factor with levels
research and development investments in millions of euros for 2002
research and development investments in millions of euros for 2003
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.
qqmath(~(RD2003 - RD2002), data = EURD, type=c("p", "r"))
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