| urine {EngrExpt} | R Documentation |
Mercury level in employee urine samples
A data frame with 12 observations on the following 5 variables.
monthJanuary to Decemberperson1person2person3person4Employees who work in a high risk area of a chemical plant are monitored monthly for mercury exposure.
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
str(urine)
dotplot(month ~ person1 + person2 + person3 + person4, urine,
outer = FALSE, type = c("p","l"),
auto.key = list(columns = 2, lines = TRUE, points = FALSE),
xlab = "Mercury level in urine")