Issue 12 in dkpro-statistics: Div-by-zero after upgrading from 1.0.2 to 2.0.0

[dkpro-st...@googlecode.com]

Status: Accepted
Owner: richard.eckart
Labels: Type-Defect Priority-Medium

New issue 12 by richard.eckart: Div-by-zero after upgrading from 1.0.2 to
2.0.0
https://code.google.com/p/dkpro-statistics/issues/detail?id=12

After upgrading from the 1.0.2 TwoRaterAgreement to the 2.0.0
CohenAgreement, I get this error when passing in an empty study:

java.lang.ArithmeticException: Division undefined
at java.math.BigDecimal.divide(BigDecimal.java:1668)
at
de.tudarmstadt.ukp.dkpro.statistics.agreement.coding.CohenKappaAgreement.calculateExpectedAgreement(CohenKappaAgreement.java:68)
at
de.tudarmstadt.ukp.dkpro.statistics.agreement.AgreementMeasure.calculateAgreement(AgreementMeasure.java:42)
at
de.tudarmstadt.ukp.clarin.webanno.brat.curation.AgreementUtils.getTwoRaterAgreement(AgreementUtils.java:85)
at
de.tudarmstadt.ukp.clarin.webanno.brat.curation.CasDiff2Test.twoEmptyCasTest(CasDiff2Test.java:121)
...

Before, I got a NaN as agreement score.

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