1. Add clone() to SummaryStatisticsImpl. This implies adding clone() to SecondMoment, Sum, SumOfSquares, Min, Max, SumOfLogs, GeometricMean, Mean, and Variance. To Mark, I think that the behavior of clone() is well implied by the Javadoc for java.lang.Object. I was surprised that I obviously had not read that before yesterday. To Phil, your suggested getSummary() method/bean would indeed solve my problem and give me even better performance. (clone() was ~20x faster than the serialize/deserialize hack I was using. This probably accounts for 2x of my overall 15x.)
2. Change TTestImpl; the commons-discovery DiscoverClass.newInstance() was being called for every call to tTest. This is not a cheap method. After #1, this method was taking up something like 17% of the runtime of my synthetic benchmark. I created a method to lazily get the DistributionFactory and store it (transient) as a class attribute.
3. Make ContinuedFraction.evaluate(...) iterative instead of recursive. This gave me a 125% (2.25x) improvement in performance of this method. I think I can optimize it further, hopefully not at the cost of readability.
Patches available on request. Should I just start posting them when I have patches like this?
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