| curl {EngrExpt} | R Documentation |
The current formulation of a coating on transparencies used in ink-jet printers causes them to curl. These data are from experiments conducted on a new formulation of the coating to reduce the amount of curl.
A data frame with 12 observations on the following 3 variables.
catalystcompacurlThese data were collected when transparencies were still widely used for presentations. With the proliferation of projectors, transparencies are being used less and less. However, coatings on paper will continue to be an area of research as coatings have to interact with a variety of printers and inks in order to be useful.
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
str(curl)
xtabs(~ catalyst + compa, curl) ## display the experimental design
xyplot(curl ~ compa | ordered(catalyst), curl,
type = c("g","p","r"), layout = c(3,1),
xlab = "Amount of component `a' - panels are amount of catalyst",
ylab = "Amount of curl")