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selection bias

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    Incentive Design Entry #0389

    The reason a rating system inflates over time

    Nobody in the system gains from a low score. When every participant benefits from inflation, the scale compresses upward until it stops distinguishing anything.

    Adept
    The hidden part #0389

    A rating scale does not collapse because reviewers are kind. It collapses because nobody in it profits from a low number.

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    Choice Design Entry #0241

    The reason a required field decides what data exists

    Optional fields are not filled at random. They are filled by an unrepresentative minority, so the resulting dataset describes respondents rather than reality.

    Adept
    The hidden part #0241

    An optional field does not collect less data. It collects data about the people willing to be counted.

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