ops (version 1.0)

findP: Find Power Exponent

Description

findP finds the exponent for an optimal power transformation of data that is to be normalized.

Usage

findP(y, step = 0.01)

Arguments

y

a 2D matrix with x- and y-coordinates of raw data in columns 'y[,1]' and 'y[,2]'

step

an optional step size for iterating normalization exponents from the interval [0;1]. Default value is '0.01'.

Value

maxIQR

The optimal exponent obtained by maximizing the inter-quartile range

minMed

The optimal exponent obtained by minimizing the distance to the median

values

Data spaces for each exponent iterated during optimization

Details

References

Ribeca P. and Sammeth M. (under review)

See Also

filter, distance

Examples

x=cbind(rexp(1000),rexp(1000))
p=findP(x)$maxIQR