Ranjan, Rajeev and Kalyanasundaram, Subrahmanyam
(2018)
Discovering Authorities as a function of time in
Community Question Answering.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
Community Question Answering (CQA) websites such as Stack Over
ow provide a great platform
to ask questions and get answers. Such platforms serve the purpose of helping the community of
people who look for answers. The platforms thrive as a result of a small group of people known as
experts who provide quality answers to question posters.
There has been a lot of work to determine experts in CQA websites, make predictions about po-
tential experts and predicting how their answering behaviour varies over time. There may be a
situation where some experts were aggressive contributors to the community at some point in time.
But gradually their contributions started to diminish and they may also finally stop contributing in
future.
We have presented an approach to rank the experts in the community as a function of time. Exper-
tise score of an expert shows how good the expert is. Higher the expertise score, better expert the
person is. Our metrics to calculate the expertise score are modifications of the existing expertise
ranking metrics such that it incorporates durations of inactivity of the expert in the community
while ranking them.
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