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    Stabilizing sparse Cox model using statistic and semantic structures in electronic medical records

    Access Status
    Fulltext not available
    Authors
    Gopakumar, S.
    Nguyen, T.
    Tran, The Truyen
    Phung, D.
    Venkatesh, S.
    Date
    2015
    Type
    Conference Paper
    
    Metadata
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    Citation
    Gopakumar, S. and Nguyen, T. and Tran, T.T. and Phung, D. and Venkatesh, S. 2015. Stabilizing sparse Cox model using statistic and semantic structures in electronic medical records, Advances in Knowledge Discovery and Data Mining, pp. 331-343. Springer.
    Source Title
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
    DOI
    10.1007/978-3-319-18032-8_26
    ISBN
    9783319180311
    School
    Multi-Sensor Proc & Content Analysis Institute
    URI
    http://hdl.handle.net/20.500.11937/9928
    Collection
    • Curtin Research Publications
    Abstract

    Stability in clinical prediction models is crucial for transferability between studies, yet has received little attention. The problem is paramount in high dimensional data, which invites sparse models with feature selection capability. We introduce an effective method to stabilize sparse Cox model of time-to-events using statistical and semantic structures inherent in Electronic Medical Records (EMR). Model estimation is stabilized using three feature graphs built from (i) Jaccard similarity among features (ii) aggregation of Jaccard similarity graph and a recently introduced semantic EMR graph (iii) Jaccard similarity among features transferred from a related cohort. Our experiments are conducted on two real world hospital datasets: a heart failure cohort and a diabetes cohort. On two stability measures - the Consistency index and signal-to-noise ratio (SNR) - the use of our proposed methods significantly increased feature stability when compared with the baselines.

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