|To:||Ontology Summit 2012 discussion <ontology-summit@xxxxxxxxxxxxxxxx>|
|From:||Simon Spero <sesuncedu@xxxxxxxxx>|
|Date:||Thu, 3 May 2012 13:56:05 -0400|
On Thu, May 3, 2012 at 10:41 AM, henson graves <henson.graves@xxxxxxxxxxx> wrote:|
It is in general not considered wise to use precision on its own as a metric for evaluating systems; this is due to the ability to arbitrarily boost precision by reducing recall. As a long as a single relevant item is selected, and no non-relevant items are selected, precision becomes 1, regardless of how many relevant items may exist.
For example, under CWA, the following representation (in subset of ACE), has perfect precision; however, the recall is almost zero. [ESOM is short for EuropeanStatisticalOfficeCompliantMarriage]
"There is exactly 1 ESOM and it hasHusband Alex and hasSpouse him and hasWife Emily and hasSpouse her. There is exactly 1 man and he is Alex and isHusbandOf Emily and isSpouseOf her. There is exactly 1 woman and she is Emily and isWifeOf Alex and isSpouseOf him."
This is not especially useful...
Most of the ESOM constraints are easily captured in OWL; others are not as well supported. For example, we can specify a role chain so saying that the the wife in the ESOM that something is the husband in is the wife of the husband, but we cannot state that the two are equivalent. Asserting that w isWifeOf h does not entail the existence of an ESOM e.
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