# PlotMonth: Cycle Plot for Seasonal Effects of an Univariate Time Series

## Description

Plot seasonal effects of a univariate time series following Cleveland's definition for cycle plots.

## Usage

PlotMonth(x, type = "l", labels, xlab = "", ylab = deparse(substitute(x)), ...)

## Arguments

- x
univariate time series

- type
one out of `"l"`

(line) or `"h"`

(histogram), defines the plot type of the year components

- labels
the labels for the cyclic component to be displayed on the x-axis

- xlab
a title for the x axis: see `title`

.

- ylab
a title for the y axis: see `title`

.

- ...
the dots are passed to the plot command.

## Author

Markus Huerzeler (ETH Zurich), slight changes Andri Signorell <andri@signorell.net>

## Details

A cycle plot is a graphical method invented to study teh behaviour of a seasonal time series. The seasonal component of a univariate series is graphed. First the January values are graphed for successive years, then the February values and so forth. For each monthly subseries the mean of the values is portrayed by a horizontal line.

## References

Cleveland, W. S. (1985)
*The Elements of Graphing Data.*
Monterey, CA: Wadsworth.