| deink {EngrExpt} | R Documentation |
De-inking of newsprint
A data frame with 27 observations on the following 3 variables.
alkalihardness50 < 150 < 250brightOne step of recycling newsprint is to "de-ink" the newsprint, that is to remove the ink. The brightness of the paper pulp after a de-inking process is a measure of how well the process to remove the ink worked.
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
str(deink)
xtabs(~ alkali + hardness, deink)
dotplot(hardness ~ bright, deink, groups = alkali,
auto.key = list(columns = 3, lines = TRUE),
type = c("p","a"), aspect = 'xy',
xlab = "Brightness by amount of alkali",
ylab = "Hardness of the water")