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Kappa Statistic (See Carletta 96 to start)

Kappa Statistic (See Carletta 96 to start). retrieved & irrelevant. Not retrieved & irrelevant. Entire document collection. irrelevant. Relevant documents. Retrieved documents. retrieved & relevant. not retrieved but relevant. relevant. retrieved. not retrieved. Precision and Recall.

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Kappa Statistic (See Carletta 96 to start)

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  1. Kappa Statistic (See Carletta 96 to start)

  2. retrieved & irrelevant Not retrieved & irrelevant Entire document collection irrelevant Relevant documents Retrieved documents retrieved & relevant not retrieved but relevant relevant retrieved not retrieved Precision and Recall

  3. C = retrieved & irrelevant D = Not retrieved & irrelevant irrelevant A = retrieved & relevant B= not retrieved but relevant relevant retrieved not retrieved Precision and Recall ACCURACY = A + D / A + B + C + D A / A + B A / A + C

  4. Precision and Recall • Precision • The ability to retrievetop-ranked documents that are mostly relevant. • Recall • The ability of the search to find all of the relevant items in the corpus.

  5. Returns relevant documents but misses many useful ones too The ideal Returns most relevant documents but includes lots of junk Trade-off between Recall and Precision 1 Precision 0 1 Recall

  6. F-Measure • One measure of performance that takes into account both recall and precision. • Harmonic mean of recall and precision: • Compared to arithmetic mean, both need to be high for harmonic mean to be high.

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