smooth {eda}R Documentation

Median Smoothing

Description

This function applies Tukey's smoothing method 3RSR to x.

Usage

smooth(x)

Arguments

x a vector or time series

Value

A vector or time series containing the smoothed values. Note that there are other smoothing methods which provide rather better results. This one was designed for hand calculations.

Note

3R stands for Repeated running medians of 3.

S and S-PLUS use a different Tukey smoother in smooth(*).

The implementation does not really implement Tukey's definitions, since it uses an incorrect version of the end-point rule repeatedly instead of once. This might be corrected in a future version of R.

References

Tukey, J. W. (1977). Exploratory Data Analysis, Reading Massachusetts: Addison-Wesley.

See Also

lowess; loess, supsmu and smooth.spline in package `modreg'.

Examples

library(eda)
data(presidents)
presidents[is.na(presidents)] <- 0
plot(presidents)
lines(smooth(presidents))

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