bootstrap (version 2019.6)

stamp: 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.

Examples

# NOT RUN {
summary(stamp)
with(stamp, {hist(Thickness);
             plot(density(Thickness), add=TRUE)})
# }