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According to a recent survey made by Nielsen NetRatings, on news articles is one of the most important activity online. Indeed, \ Google, \ Yahoo, \ MSN and many others have proposed commercial search engines for indexing news. Despite this commercial interest, no academic research has on ranking a stream of news articles and a set of news sources. In this paper, we introduce this problem by proposing a ranking framework which models: (1) the process of generation of a stream of news articles, (2) the news articles clustering by topics, and (3) the evolution of news story over the time. The ranking algorithm proposed ranks news information, finding the authoritative news sources and identifying the most interesting events in the different categories to which news article belongs. All these ranking measures take in account the time and can be obtained without a predefined sliding window of over the stream. The complexity of our algorithm is linear in the number of pieces of news still under consideration the time of a new posting. This allow a continuous on-line process of ranking. Our ranking framework is validated on a collection of more than 300. 000 pieces of news, produced in two months by more of 2000 news sources belonging to 13 different (World, U. S, Europe, Sports, Business, etc). This collection is extracted from the index of \ comeToMyHead, an news search engine available online.
Corso et al. (Sat,) studied this question.