Fit data to a power distribution (java)

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Much like in Excel where we can take a distribution and make a trendline for it (power law), how can I calculate that in Java for an array of numbers?

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The package org.apache.commons.math.optimization.fitting includes CurveFitter and PolynomialFitter that will cover many of the typical excel trend line options. JFreechart includes some support for Regression.