By Daniel T. Larose, Zdravko Markov
This e-book introduces the reader to tools of knowledge mining on the net, together with uncovering styles in websites (classification, clustering, language processing), constitution (graphs, hubs, metrics), and utilization (modeling, series research, performance).
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Additional resources for Data Mining the Web: Uncovering Patterns in Web Content, Structure, and Usage
That is, ri = if di ∈ Dq otherwise 1 0 We also add a parameter k ≥ 0 that represents the number of documents from the top of the list Rq that we consider. Thus, we deﬁne precision at rank k as precision (k) = 1 k k ri i=1 and recall at rank k as recall (k) = 1 |Dq | k ri i=1 If we ﬁx k and consider the top k elements from Rq as a set, the new measures work exactly the same as the set-based measures. , decreasing rank). The average precision is the measure that accounts for this: average precision = 1 |Dq | |D| rk × precision (k) k=1 The average precision is a useful measure that combines precision and recall and also evaluates document ranking.
As reported by Brin and Page  in 1998, Google indexed 24 million pages and over 259 million anchors. EVALUATING SEARCH QUALITY Information retrieval systems do not have formal semantics (such as that of databases), and consequently, the query and the set of documents retrieved (the response of the IR system) cannot be mapped one to one. Therefore, some measures are used to evaluate the degree of ﬁtness (accuracy) of the response. A standard benchmark for this purpose is the recall-precision measure, which is also used in related areas (such as machine learning and data mining).
1). 4, where the vectors are rows in the table (the ﬁrst column is the vector name and the rest are its coordinates). Note that the coordinates of the document vectors changed their scale, but relative to each other they are more or less the same. This is because the factors used for scaling down the term frequencies are similar (documents are similar in length). In the next step, IDF will, however, change the coordinates substantially. 559616 These numbers reﬂect the speciﬁcity of each term with respect to the document collection.