stamp {bootstrap} | R Documentation |
Data on Thickness of Stamps
Description
Thickness in millimeters of 485 postal stamps, printed in 1872. The stamp issue of that year was thought to be a "philatelic mixture", that is, printed on more than one type of paper. It is of historical interest to determine how many different types of paper were used.
Usage
data(stamp)
Format
A data frame with 485 observations on the following variable.
- Thickness
Thickness in millimeters, a numeric vector
Details
In the book, this is used to exemplify determination of number of modes. It is also used for kernel density estimation.
Note
The main example in the book is on page 227. See also the CRAN package diptest for an alternative method.
Source
Efron, B. and Tibshirani, R. (1993) An Introduction to the Bootstrap. Chapman and Hall, New York, London.
Examples
summary(stamp)
with(stamp, {hist(Thickness);
plot(density(Thickness), add=TRUE)})
[Package bootstrap version 2019.6 Index]