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Plots a Ford (battleship curve) diagram.

Usage

plot_ford(object, ...)

# S4 method for matrix
plot_ford(object, EPPM = FALSE)

# S4 method for data.frame
plot_ford(object, EPPM = FALSE)

Arguments

object

A \(m \times p\) numeric matrix or data.frame of count data (absolute frequencies giving the number of individuals for each class).

...

Currently not used.

EPPM

A logical scalar: should the EPPM be drawn? This argument is defunct: use seriograph() instead.

Value

A ggplot2::ggplot object.

References

Ford, J. A. (1962). A quantitative method for deriving cultural chronology. Washington, DC: Pan American Union. Technical manual 1.

Author

N. Frerebeau

Examples

## Data from Desachy 2004
data("compiegne", package = "folio")

## Plot a Ford diagram
plot_ford(compiegne)