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{
    "pk": 27332,
    "title": "Improving a Fundamental Measure of Lexical Association",
    "subtitle": null,
    "abstract": "Pointwise mutual information (PMI), a simple measure of\nlexical association, is part of several algorithms used as\nmodels of lexical semantic memory. Typically, it is used as a\ncomponent of more complex distributional models rather than\nin isolation. We show that when two simple techniques are\napplied—(1) down-weighting co-occurrences involving low-\nfrequency words in order to address PMI’s so-called\n“frequency bias,” and (2) defining co-occurrences as counts\nof “events in which instances of word1 and word2 co-occur in\na context” rather than “contexts in which word1 and word2 co-\noccur”—then PMI outperforms default parameterizations of\nword embedding models in terms of how closely it matches\nhuman relatedness judgments. We also identify which down-\nweighting techniques are most helpful. The results suggest\nthat simple measures may be capable of modeling certain\nphenomena in semantic memory, and that complex models\nwhich incorporate PMI might be improved with these\nmodifications.",
    "language": "eng",
    "license": {
        "name": "",
        "short_name": "",
        "text": null,
        "url": ""
    },
    "keywords": [
        {
            "word": "semantic spaces; word space models; semantic\nmemory; semantic networks; computational models"
        }
    ],
    "section": "Posters: Papers",
    "is_remote": true,
    "remote_url": "https://escholarship.org/uc/item/4063q17v",
    "frozenauthors": [
        {
            "first_name": "Gabriel",
            "middle_name": "",
            "last_name": "Recchia",
            "name_suffix": "",
            "institution": "University of Cambridge",
            "department": ""
        },
        {
            "first_name": "Paul",
            "middle_name": "",
            "last_name": "Nulty",
            "name_suffix": "",
            "institution": "University of Cambridge",
            "department": ""
        }
    ],
    "date_submitted": null,
    "date_accepted": null,
    "date_published": "2017-01-01T18:00:00Z",
    "render_galley": null,
    "galleys": [
        {
            "label": "PDF",
            "type": "pdf",
            "path": "https://journalpub.escholarship.org/cognitivesciencesociety/article/27332/galley/16968/download/"
        }
    ]
}