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Exit polls vs official results literacy

Election night prices often jump the moment exit polls are published. Those polls are serious research, but they are estimates with real error and they are revised during the night. Event contracts settle on official results or named race calls, not on the first projection. This SoftCta guide explains how exit polls are built, why they move, and how to read a price that is reacting to them.

How exit polls are built

Pollsters interview voters at a sample of polling places and, increasingly, survey early and mail voters by phone or online. Responses are weighted to estimates of turnout and past results. In the US, networks share data from consortium surveys; in the UK, a joint broadcaster exit poll projects seat totals at 10pm when polls close.

Why early numbers shift

Initial figures are weighted to pre-election expectations because few votes have been counted. As returns arrive, the data are reweighted to match them. A published vote share can move by several points over the night, and early leaks before polls close are often unreliable. Our sample size illusion guide explains why small early samples mislead.

Error sources

Exit polls face non-response bias, differences between in-person and mail voters, and changing turnout patterns. Their margin of error is wider than many readers assume, and it is larger for subgroups. See reading poll margins of error for the general habit of keeping a range.

Projections versus calls versus certification

An exit poll projection is not a race call. Decision desks combine exit polls with counted votes and models before calling a race, and certification comes days or weeks later. Our guides to race calls and certification and canvass explain each step. SoftCta readers check which one the contract names.

Reading the price reaction

When an exit poll lands, prices can move sharply in seconds. That reflects new information, but also crowd reaction. Our guide to how news moves implied probability suggests asking how much the poll actually changes your range, given its known error, rather than chasing the move.

A worked example

A contract on whether a party wins a parliamentary majority trades at an illustrative 55 cents Yes before polls close. The exit poll projects the party 8 seats over the majority line, and the price jumps to 82 cents. The reader recalls that past exit polls have missed seat totals by a dozen or more in some elections, writes a range of 70 to 80 percent, and converts with the implied probability tool. They verify live cents on the venue. Substantial risk of loss.

Common mistakes

Treating leaked early figures as final. Assuming a projection equals a result. Ignoring mail and early votes counted later. Reading subgroup numbers as precise. Trading on a projection without knowing the settlement source. SoftCta pages avoid sure-thing election-night calls.

Primary sources SoftCta readers open

SoftCta readers open the pollster or broadcaster methodology notes for the exit poll, the official election authority results page, and the named decision desk if the contract uses one. They log the time of each projection and count, and keep commentary in a context column.

Reading the quote step by step

• Read the full title and rules, including the named settlement source and the time zone.
• Convert the Yes and No prices to implied probabilities and note the gap between them.
• Subtract fees and spread to see the effective price you would actually face.
• Write your own probability range and the evidence behind it, then compare.
• Check related and near-duplicate markets on other venues for consistency.

Closing SoftCta checklist

• Re-read the venue definition in your own words before reacting to a price.
• Convert prices with fee and spread awareness; verify live cents on the operator.
• Prefer primary settlement sources over secondary headlines and social summaries.
• Treat ChanceWire hubs, movers, and tools as orientation — not order entry.
• Confirm age, location, and product eligibility; SoftCta pages will not suggest location spoofing.
• If clarity is incomplete, watching is a complete SoftCta outcome — no pick-selling urgency required.

SoftCta habits

• Write your own probability range before checking the crowd price.
• Prefer dated primary sources over social summaries.
• Compare related markets when a single book looks extreme.
• Size curiosity with fees and depth in mind; substantial risk of loss.