R: Thickness of US Lincoln Pennies

penny {gss} | R Documentation

## Thickness of US Lincoln Pennies

### Description

Thickness of US Lincoln pennies minted during years 1945 through 1989.

### Usage

    data(nox)

### Format

A data frame containing 90 observations on the following variables.

`year` | Year minted.
`mil` | Thickness in mils.

### Source

Scott, D. W. (1992), Multivariate Density Estimation: Theory, Practice and Visualization. New York: Wiley.

### References

Gu, C. (1995), Smoothing spline density estimation: Conditional distribution, Statistica Sinica, 5, 709–726.

Scott, D. W. (1992), Multivariate Density Estimation: Theory, Practice and Visualization. New York: Wiley.

[Package gss version 2.2-2 Index]