De-inking of newsprint

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Description

De-inking of newsprint

Format

A data frame with 27 observations on the following 3 variables.

alkali

amount of alkali in the solution

hardness

hardness of the water - an ordered factor with levels 50 < 150 < 250

bright

a measure of brightness

Details

One 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.

References

Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)

Examples

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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")

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