Event probability and response share
On Polymarket, an outcome position’s price reflects a market estimate of a condition being met. A poll can ask preference, approval or expectations. Establish which response share it reports. Support does not turn the percentage of respondents into a win probability.
Illustrative example: 52% of surveyed people prefer A, while a hypothetical market prices A’s win at 70%. These are different statements; neither automatically disproves the other.
Check who answers and how
For a poll, inspect the target population, sample size and selection, fieldwork dates, question and response options. Pew Research Center explains that wording and question order can influence answers. Matching headlines do not establish equivalent surveys.
For a market, examine available trading information, freshness and liquidity. It is not a random population sample; transaction volume does not identify the number of independent opinions represented.
Match the horizon and target result
A poll of current preferences and a question about a result one month later have different horizons. The event definition also matters: winning a vote, being appointed and taking office can differ. A shared topic does not make them one forecast.
Record both observation times. A current market beside an older poll may reflect newer information; that alone does not demonstrate that one method is more accurate.
Evaluate accuracy on an appropriate series
Evaluate probabilities across comparable completed questions observed at a consistent horizon. Polymarket’s accuracy page describes pre-resolution snapshots and a Brier score. One successful outcome cannot establish the quality of every subsequent estimate.
Illustrative example: an event assigned 70% can still fail to occur. Assessing calibration requires a series of estimates and confirmed outcomes, rather than one headline written after the event.
FAQ /
Common questions
Does 70% on a market mean 70% of people support it?
No. It interprets an outcome-position price as a probability. A respondent share requires a separate survey and its methodology.
Are prediction markets always more accurate than polls?
That general claim does not follow from an individual example. Match the questions, horizons, data and evaluation method.