PlotProductratio function

Product-Ratio Plot

The product-ratio plot as defined in [Tukey, 1977, p. 594].

PlotProductratio(X, Y, na.rm = FALSE, 

main='Product Ratio Analysis',xlab = "Log of Ratio",ylab = "Root of Product", ...)

Arguments

• X: [1:n] positive numerical vector, negativ values are removed automatically
• Y: [1:n] positive numerical vector, negativ values are removed automatically
• na.rm: Function may not work with non finite values. If these cases should be automatically removed, set parameter TRUE
• main: see plot
• ylab: see plot
• xlab: see plot
• ...: further arguments passed on to plot

Details

In the case where there are many instances of very small values, but a small number of very large ones, this plot is usefull [Tukey, 1977, p. 615].

Returns

matrix[1:n,2] with sqrt(x*y) and log(x/y) as the two columns

References

[Tukey, 1977] Tukey, J. W.: Exploratory data analysis, United States Addison-Wesley Publishing Company, ISBN: 0-201-07616-0, 1977.

Author(s)

Michael Thrun

Examples

#Beware: The data does no fit ne requirements for this approach
data('ITS')
data(MTY)
PlotProductratio(ITS,MTY)