ex04.80 {Devore5} | R Documentation |
The ex04.80
data frame has 10 rows and 1 columns of bearing
lifetimes.
This data frame contains the following columns: describe{ item{lifetime}{ a numeric vector } }
Devore, J. L. (2000) Probability and Statistics for Engineering and the Sciences (5th ed), Duxbury
(1985), "Modified Moment Estimation for the three-parameter Log-normal distribution", Journal of Quality Technology, 92㫻.
library(Devore5) data(ex04.80) attach(ex04.80) boxplot(lifetime, ylab = "Lifetime (hr)", main = "Bearing lifetimes from exercise 4.80", col = "lightgray") ## Normal probability plot on the original time scale qqnorm(lifetime, ylab = "Lifetime (hr)", las = 1) qqline(lifetime) ## Try normal probability plot of the log(lifetime) qqnorm(log(lifetime), ylab = "log(lifetime) (log(hr))", las = 1) qqline(log(lifetime)) detach()