@subsubheading Description

Freeny’s data on quarterly revenue and explanatory variables.

@subsubheading Format

Freeny’s dataset consists of one observed dependent variable
(revenue) and four explanatory variables (lagged quartery
revenue, price index, income level, and market potential).

@table @code
@item date
Start date of the quarter for the observation.
@item y
Observed quarterly revenue.
TODO: Determine units (probably millions of USD?)
@item lag_quarterly_revenue
Quarterly revenue (@code{y}), lagged 1 quarter.
@item price_index
A price index
@item income_level
??? TODO: Fill this in
@item market_potential
??? TODO: Fill this in
@end table

@subsubheading Source

Freeny, A. E. (1977). @cite{A Portable Linear Regression Package with Test
Programs}. Bell Laboratories memorandum.

@subsubheading References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988). @cite{The New S
Language}. Monterey: Wadsworth & Brooks/Cole.

@subsubheading Examples

@example
@INCLUDE_DATASET_EXAMPLE_SCRIPT{freeny_1.m}
@end example
