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Announcing Magnum Opus 4.2

G. I. Webb & Associates are pleased to announce the release of Magnum Opus 4.2 for Windows and Linux.

Magnum Opus 4.2 introduces a number of significant enhancements to functionality.

New holdout evaluation test for itemsets

Magnum Opus 4.2 incorporates a test for self-sufficient itemsets.  An itemset is self-sufficient if its coverage is higher than can be accounted for solely in terms of the coverage of either its subsets or supersets.  For example, the last of the following itemsets is not self-sufficient because it has exactly the coverage that should be expected given the coverage of each of the items it contains.  Note that such an itemset fails the test for improvement that is required when a test for self-sufficiency is performed.

a [Coverage=0.500 (500); Leverage=0.0000 (0.0); p=0.000000]
b [Coverage=0.500 (500); Leverage=0.0000 (0.0); p=0.000000]
a & b [Coverage=0.250 (250); Leverage=0.0000 (0.0); p=0.525212]

Nor is the first of the next two itemsets self-sufficient.  In this case it is because the second itemset, which is a superset of the first, accounts for all of the coverage of the first.

a & b [Coverage=0.500 (500); Leverage=0.0000 (0.0); p=0.000000]
a & b & c [Coverage=0.500 (500); Leverage=0.0000 (0.0); p=0.000000]

Improved progress reports

As rules or itemsets are being found, Magnum Opus 4.2 reports on the number found so far and the minimum and maximum value for the target metric of those found.

Bug fix

Magnum Opus 4.1 fixes a bug in versions 3.0 to 4.1 that could result in itemsets containing more than 3 items being incorrectly identified as failing a test for improvement.

To find out more...

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