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    <title>Tetrad IV Overview</title>
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<p>This document is the API specification for the Tetrad application,
    version 4_2. The home page for the Tetrad project (including a brief
    history of the various versions and download instructions) see <a
            href="http://www.phil.cmu.edu/tetrad">
        http://www.phil.cmu.edu/tetrad</a>.
    The core theory of the Tetrad application is described Spirtes,
    Glymour, and Scheines, <i>Causation, Prediction, and Search</i> (1993,
    2000). </p>
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