David, take a look at ec/app/SimpleXYSeriesChartStatistics.java. In there, note that it calls addDataPoint every once in a while, passing it the fitness it's computed after evaluation. You can modify this in a straightforward fashion, by just gathering the average fitness over the individuals in the populations rather than gathering the best fitness. Sean On Feb 5, 2008, at 1:59 PM, David vun Kannon wrote: > What is the best way to chart mean fitness per generation instead > of best fitness? If I want to calculate my own arbitrary statistic > on the population each generation and chart it, what do I need to > do in Statistics? Also, is there a way to chart the average of a > statistic over a set of runs? > > Thanks, > David vun Kannon