[
https://issues.apache.org/jira/browse/TEXT-130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rob Tompkins updated TEXT-130:
------------------------------
Assignee: Rob Tompkins
> JaroWinklerDistance: Wrong results due to precision of transpositions
> ---------------------------------------------------------------------
>
> Key: TEXT-130
> URL: https://issues.apache.org/jira/browse/TEXT-130
> Project: Commons Text
> Issue Type: Bug
> Reporter: Jan Martin Keil
> Assignee: Rob Tompkins
> Priority: Major
>
> The method {{JaroWinklerDistance#matches}} returns {{transpositions / 2}} as
> integer. However, it is not granted for {{transpositions}} to be even. E.g.
> comparing "aaabcd" and "aaacdb" will result in {{transpositions}} = 3.
> Therefore the method must return 1.5, not 1. Otherwise the similarity is
> 0.9611111111111111 instead of 0.9416666666666667.
> I recommend to return {{halfTranspositions}} instead of {{transpositions}}
> and doing the cast and division ({{(double) mtp[1] / 2}}) in
> {{JaroWinklerDistance#apply}}.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
