Power and bias of subset pooling strategies

  • Authors:
  • Gordon V. Cormack;Thomas R. Lynam

  • Affiliations:
  • University of Waterloo, Waterloo, ON, Canada;University of Waterloo, Waterloo, ON, Canada

  • Venue:
  • SIGIR '07 Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval
  • Year:
  • 2007

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Abstract

We define a method to estimate the random and systematic errors resulting from incomplete relevance assessments.Mean Average Precision (MAP) computed over a large number of topics with a shallow assessment pool substantially outperforms -- for the same adjudication effort MAP computed over fewer topics with deeper pools, and P@k computed with pools of the same depth. Move-to-front pooling,previously reported to yield substantially better rank correlation, yields similar power, and lower bias, compared tofixed-depth pooling.