A two-observable urn model — pairwise containment plus a new closed-form discovery curve — recovers crawl coverage, persistence, and a core/shell split, but the shell residual shows the model is still incomplete.
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Biometrics 43(4), 783–791 (1987)
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Measuring What the Crawler Sees: Discovery Curves, Core Persistence, and Shell Dynamics in Longitudinal Web Crawls
A two-observable urn model — pairwise containment plus a new closed-form discovery curve — recovers crawl coverage, persistence, and a core/shell split, but the shell residual shows the model is still incomplete.