Ad-hoc aggregations of ranked lists in the presence of hierarchies
Nilesh Bansal, Sudipto Guha, Nick Koudas · 2008
A variety of web sites and web based services produce textual lists at varying time granularities ranked according to several criteria. For example, Google Trends produces lists of popular query keywords which can be visualized according to several criteria. At Flickr, lists of popular tags used to tag the images uploaded can be visualized as a cloud based on their popularity. Identification of the k most popular terms can be easily conducted by utilizing well known rank aggregation algorithms.