Percentage fat in cheese

Description

A manufacturer of cheese supplies a major pizza chain from three different manufacturing locations. Samples from 6 different batches at each of three different plants were assayed for the percentage fat content.

Format

A data frame with 90 observations on the following 3 variables.

plant

the plant where the cheese was manufactured - a factor with levels A, B and C

batch

the batch of cheese - a factor with levels a to f. Note that batch a from plant A is not related to batch a from plants B or C

fat

fat content of the cheese (%)

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(cheese)
bwplot(batch ~ fat|plant, cheese, layout = c(1,3), strip = FALSE,
       strip.left = TRUE,
       xlab = "Percentage fat content of batches from three plants")
dotplot(reorder(reorder(plant:batch, fat), as.numeric(plant)) ~ fat |
        reorder(plant, fat), cheese, strip = FALSE, strip.left = TRUE,
        layout = c(1, 3), scales = list(y = list(relation = "free")),
        aspect = 0.2, type = c("p", "a"), xlab =
"Percentage fat content - lines join mean fat content per batch",
        ylab = "Batch within plant", jitter.y = TRUE)

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