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From "André Panisson" <>
Subject Utility method to aggregate Statistics
Date Tue, 09 Sep 2008 15:33:28 GMT

I'm writing a complex validation algorithm, that makes a K-Fold
cross-validation using a data set. The data set is partitioned into K
subsamples, and of the K subsamples, a single subsample is retained as
the validation data for testing, and the remaining K − 1 subsamples
are used as training data. The process is then repeated K times, and
at the end the K results are aggregated to a single result.
The problem is that all K results return Statistics objects
(org.apache.commons.math.stat.descriptive.SummaryStatistics), and I
need to make the aggregation of all K objects in a single Statistics.
I think it is a common problem in the statistics field. There's anyone
who had already implemented an utility method to do it?
Or maybe it would be interesting to request it as an Improvement to
the Commons Math developers, adding an "aggregator" to all Statistics

Thanks in advance,

Andre Panisson

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