cheese {EngrExpt} | R Documentation |
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
andC
batch
the batch of cheese - a factor with levels
a
tof
. Note that batcha
from plantA
is not related to batcha
from plantsB
orC
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
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)
[Package EngrExpt version 0.1-8 Index]