Filtered dossier

self-selection

  • 3 / 3
  • 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
  • No visual on file
    Price Psychology Entry #0369

    Why a trial that requires a card converts differently

    Asking for a card removes the casual sign-ups and changes what the free period means. Fewer arrive, and the ones who arrive behave as buyers.

    Adept
    The hidden part #0369

    A card field is not friction on one offer. It is a second offer, selecting different people and reframing the free period as a purchase.

    Open file
  • No visual on file
    Paradox & Proof Entry #0173

    Why the sample that looks representative usually is not

    A sample that resembles the population on visible traits was selected for resemblance. Selection on the visible says nothing about the rest.

    Adept
    The hidden part #0173

    Matching on what can be checked constrains only what was checked. The variable that decides the result is the one no weighting touched.

    Open file