Description

Yellowing of paint for different pigments

Format

A data frame with 9 observations on the following 3 variables.

batch

a factor with levels A, B and C

pigment

a factor with levels A, B and C

deltab

a numeric vector

Details

This experiment was to study the impact of pigments on the quality of a white paint. The measure of interest was delta b (smaller is better). Three batches of paint were use to test each of the three pigments (so there were three measurements for each pigment, one from each batch).

References

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

Examples