Filtered dossier

Hidden Numbers

Quantities that hide a rule you never agreed to.

  • 12 / 12
  • No visual on file
    Incentive Design Entry #0388

    Why punishing failure removes reporting, not failure

    Penalties attach to the report, not to the event. Reports are voluntary and events are not, so the measurable quantity falls while the underlying one does not.

    Novice
    The hidden part #0388

    A penalty on reports does not reduce the events. It reduces the only record that the events occurred.

    Open file
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    Statistical Illusions Entry #0450

    Why the missing data is the most informative column

    Absence has a shape. Which records lack a value is usually related to what the value would have been, so dropping them changes the population.

    Adept
    The hidden part #0450

    If presence depends on the value, dropping incomplete rows selects on the variable of interest. Model the missingness — it is often the better predictor.

    Open file
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    Statistical Illusions Entry #0449

    The reason a benchmark becomes a distortion

    A published comparison reorganises the thing it measures. Effort moves to the scored dimensions, and the unscored ones become where the cost is paid.

    Master
    The hidden part #0449

    Publishing a comparison makes it an intervention. Effort migrates to the scored dimensions, and the unscored ones have no series to show the loss.

    Open file
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    Statistical Illusions Entry #0448

    Why a rounded figure travels further than a precise one

    Transmission selects for what can be repeated without effort. A round number survives the retelling; the decimal is dropped at the first hop.

    Adept
    The hidden part #0448

    Retelling is a memory task, and round numbers are cheaper to store and produce. Precision is lost by selection, not by dishonesty.

    Open file
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    Statistical Illusions Entry #0447

    The reason a compound rate deceives over long periods

    People extend growth in straight lines because that is what intuition supplies. The gap between the line and the curve is where the surprise lives.

    Adept
    The hidden part #0447

    Intuition extrapolates by addition and the process multiplies. Short horizons reward the habit, and long ones are where it fails.

    Open file
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    Statistical Illusions Entry #0446

    Why a lagging statistic invites the wrong correction

    The number describes a situation that has already moved. Acting hard on it applies force in the direction the system has just finished going.

    Novice
    The hidden part #0446

    When the measurement lag matches the system’s response time, a proportional correction becomes an oscillation. Each step is defensible; the sequence is not.

    Open file
  • No visual on file
    Statistical Illusions Entry #0445

    The reason a self-selected panel overstates strong opinions

    Answering costs time, and the people who pay it are those with something to say. Indifference is the hardest state to get into a dataset.

    Master
    The hidden part #0445

    Willingness to answer is itself an attitude, and weighting cannot repair it. Indifference is the state a voluntary survey cannot record.

    Open file
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    Statistical Illusions Entry #0444

    Why the sample frame decides the result

    Sampling errors shrink with size; frame errors do not. If the list you draw from excludes a group, no amount of sampling from it will find them.

    Adept
    The hidden part #0444

    Size shrinks sampling error and leaves coverage error untouched. A precise estimate of a frame is not an estimate of a population.

    Open file
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    Statistical Illusions Entry #0443

    The reason a leading indicator stops leading

    It led because of a structure that produced the delay. When the structure changes, the correlation stays in the historical data and leaves the future.

    Novice
    The hidden part #0443

    An indicator leads because of a structure, not because of its history. Fit is measured with data nobody had at the time.

    Open file
  • No visual on file
    Statistical Illusions Entry #0442

    Why a cluster is expected in random data

    Randomness produces clumps. A pattern spread out evenly is the unlikely arrangement, so finding a cluster is not yet finding a cause.

    Adept
    The hidden part #0442

    Independent events arrive in bursts, so a cluster is the expected texture rather than a signal. Evenness is what would need explaining.

    Open file
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    Scarcity & Queues Entry #0475

    Why a queue that moves is tolerated longer than a shorter one that stalls

    Waiting is judged by whether anything is happening, not by minutes. A stalled four-minute wait is experienced as longer than a moving eleven.

    Adept
    The hidden part #0475

    Movement is evidence the wait is finite. Remove it and the perceived duration detaches from the clock.

    Open file
  • No visual on file
    Scarcity & Queues Entry #0474

    The reason free tickets are less used than paid ones

    A paid ticket creates something to waste. A free one leaves nothing behind if the evening turns out to be raining and the sofa is closer.

    Master
    The hidden part #0474

    A price creates something to waste and screens for intent. Whether that beats reaching more people depends on how much effort using the thing takes.

    Open file