ex1509 {Sleuth2}

Sunspot Counts for 1749–1948

Description

Time series data set of annual counts of sunspots.

Usage

ex1509

Format

A data frame with 200 observations on the following 2 variables.

Year

year

Spots

number of sunspots

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Waldmeier, M. (1961). The Sunspot Activity in the Years 1610–1960, Federal Observatory, Zurich.

Examples

str(ex1509)