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Eric Beaudoin
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Deep Web & Dark Web

Deep Web Data Source Size by Capture-recapture Method

Estimating deep web data source size by capture-recapture method

This paper addresses the problem of estimating the size of a deep web data source that is accessible by queries only. Since most deep web data sources are noncooperative, a data source size can only be estimated by sending queries and analyzing the returning results. We propose an efficient estimator based on the capture-recapture method. First we derive an equation between the overlapping rate and the percentage of the data examined when random samples are retrieved from a uniform distribution. This equation is conceptually simple and leads to the derivation of an estimator for samples obtained by random queries.

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