Below is a treemap which depicts the number of articles contributed by each source as a proportion of the total number of articles from Jul 1, 2010 until Jul 8, 2010.
Select below at least two sources to compare using Jaccard Index and Dice's Coefficient similarity measures.
The sources page shows both a pie chart and a treemap of the newspaper sources by their contribution to the overall collection of articles. Click on the the section of the treemap for the source you want more information about and you can look deeper into the contribution and topical diversity of that source.
Topical Diversity refers to the diversity 'score' which ONDA has assigned to a source for a certain time period (and perhaps other parameters). It refers to the number of topics/clusters a source is covering in a given period, such as a day, as a proportion of all the topics covered by all sources on that day. For example, the Guardian may have a score of 0.4 on one day, meaning 40% of the topics of the day were covered by the Guardian, but the Mail may have 0.5, which is a higher score meaning 50% of the topics were covered.
A treemap is a way of visualizing hierarchical data in an intuitive way. Each section of the treemap corresponds to a value for something, such a topic size or the number of articles contributed by a source. The larger the section as a proportion of the entire treemap, the higher the value of whatever it's representing.
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