cure {EngrExpt}

Yield from a chemical curing process

Description

Process engineers wish to determine a “bake window”, the combination of time and temperature in a curing process, that will maximize the yield of the product.

Format

A data frame with 18 observations on the following 3 variables.

time

time - an ordered factor with levels 20 < 40

temp

temperature - an ordered factor with levels Low < Med < High

yield

yield of parts

References

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

Examples

str(cure)
dotplot(temp ~ yield, cure, groups = time, type = c("p","a"),
        jitter.y = TRUE, xlab = "Yield of parts")
summary(fm1 <- lm(yield ~ time * temp, cure))