R: Data on Thickness of Stamps

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]