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A Review of Probabilistic Opinion Pooling Algorithms with Application to Insider Threat Detection

Author

Listed:
  • Jared A. Beekman

    (Innovative Decisions, Inc., Vienna, Virginia 22182)

  • Ronald F. A. Woodaman

    (Innovative Decisions, Inc., Vienna, Virginia 22182)

  • Dennis M. Buede

    (Innovative Decisions, Inc., Vienna, Virginia 22182)

Abstract

We retrospectively explore the effectiveness of various probabilistic opinion pools against a set of insider threat detection modeling data from a recently completed, multiyear, sponsored research effort. We explored four opinion pools: the linear opinion pool (likely the most popular), the beta-transformed linear opinion pool, the geometric opinion pool, and a multiplicative method based on odds called Bordley’s formula. The data for our study came from our recent work in the inference of insider threats for our research sponsor. In this work, we created a multimodeling inference enterprise modeling (MIEM) process to either predict threats within a population or, given the threats, predict how well the enterprise system can detect those threats. As part of larger research challenges designed by the research sponsor, we applied the MIEM process quarterly to respond to a sequence of varying challenge problems (CPs). Via MIEM, we developed multiple, independent computation forecast models. These models generated certainty intervals to answer CP questions. These intervals were fused into a single interval for each question via an expert panel prior to submission. The sponsors scored the responses against ground truth. In this paper, we (a) ask which pooling functions work best on these data and consider why, and (b) compare this performance to the actual submissions to determine if one of the pooling functions performed better than our judgment-based fusion.

Suggested Citation

  • Jared A. Beekman & Ronald F. A. Woodaman & Dennis M. Buede, 2020. "A Review of Probabilistic Opinion Pooling Algorithms with Application to Insider Threat Detection," Decision Analysis, INFORMS, vol. 17(1), pages 39-55, March.
  • Handle: RePEc:inm:ordeca:v:17:y:2020:i:1:p:39-55
    DOI: 10.1287/deca.2019.0399
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    References listed on IDEAS

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