jevons: Jevon's gold coin data

In alr3: Data to Accompany Applied Linear Regression 3rd Edition

Description

In a study of coinage, W. Stanley Jevons weighed 274 gold sovereigns that he had collected from circulation in Manchester, England. For each coin, he recorded the weight, after cleaning, to the nearest .001 gram, and the date of issue. The age classes are coded 1 to 5, roughly corresponding to the age of the coin in decades. The standard weight of a gold sovereign was suppose to be 7.9876 grams; minimum legal weight was 7.9379 grams.

Format

This data frame contains the following columns:

Age

Age of coins, decades

n

Number of coins

Weight

Average weight, grams

SD

Standard deviation.

Min

Minimum weight

Max

Maximum weight

Source

Stephen Stigler

References

Weisberg, S. (2005). Applied Linear Regression, 3rd edition. New York: Wiley, Problem 5.6.

Examples

head(jevons)

Example output

Loading required package: car
  Age   n Weight      SD   Min   Max
1   1 123 7.9725 0.01409 7.900 7.999
2   2  78 7.9503 0.02272 7.892 7.993
3   3  32 7.9276 0.03426 7.848 7.984
4   4  17 7.8962 0.04057 7.827 7.965
5   5  24 7.8730 0.05353 7.757 7.961

alr3 documentation built on May 2, 2019, 5:39 a.m.