EXPIRATIONS: Puerto Rico, South Dakota, and Montana

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Expired prediction markets

InTrade

Previous blog posts by Chris F. Masse:

  • IIF’s SIG on Prediction Markets
  • Science
  • Why did prediction markets do well in the pre-polling era, professor Strumpf?
  • Mozilla FireFox users, do you have trouble downloading academic papers (as PDF files) from SSRN?
  • “Impact Matrix. Used to collect and gauge the likelihood and business impact of various events in the very long term.”
  • Ends and Means of Prediction Markets — Tom W. Bell Edition
  • How to run enterprise prediction markets… legally

75,000 people turned out to hear Barack Obama at Waterfront Park, Portland, Oregon, U.S.A.

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Record Obama Crowd, the Size of a City

Oregon&#8217-s Democratic Primary

InTrade

Price for Oregon Democratic Primary. May 20th at intrade.com

BetFair

Kentucky&#8217-s Democratic Primary

InTrade

Price for Kentucky Democratic Primary. May 20th at intrade.com

BetFair

NewsFutures

Some delegates from FL or MI will be seated at the Democratic Convention.

© NewsFutures

First look at individual states for the 2008 US presidential elections

2008 US Presidential Election Winner – Individual

Price for 2008 Presidential Election Winner (Individual) at intrade.com

Price for 2008 Presidential Election Winner (Individual) at intrade.com

Price for 2008 Presidential Election Winner (Individual) at intrade.com

2008 US Presidential Elections

Source: Dynamic, compound prediction market charts from InTrade

Next US President

Next US President

Winning Party

Winning Party

Female President?

Female President?

Democratic Candidate

Democratic Candidate

Republican Candidate

Republican Candidate

Source: BetFair Politics Zone

Barack Obama to win the Democratic nomination


© NewsFutures

Hillary Clinton to win the Democratic nomination


© NewsFutures

Next US President Will Be Democratic.


© NewsFutures

Next US President Will Be Republican.


© NewsFutures

Explainer On Prediction Markets

Prediction markets produce dynamic, objective probabilistic predictions on the outcomes of future events by aggregating disparate pieces of information that traders bring when they agree on prices. Prediction markets are meta forecasting tools that feed on the advanced indicators (i.e., the primary sources of information). Garbage in, garbage out&#8230- Intelligence in, intelligence out&#8230-

A prediction market is a market for a contract that yields payments based on the outcome of a partially uncertain future event, such as an election. A contract pays $100 only if candidate X wins the election, and $0 otherwise. When the market price of an X contract is $60, the prediction market believes that candidate X has a 60% chance of winning the election. The price of this event derivative can be interpreted as the objective probability of the future outcome (i.e., its most statistically accurate forecast). A 60% probability means that, in a series of events each with a 60% probability, then 6 times out of 10, the favored outcome will occur- and 4 times out of 10, the unfavored outcome will occur.

Each prediction exchange organizes its own set of real-money and/or play-money markets, using either a CDA or a MSR mechanism.

More Info:

– The Best Resources On Prediction Markets = The Best External Web Links + The Best Midas Oracle Posts

– Prediction Market Science

– The Midas Oracle Explainers On Prediction Markets

– All The Midas Oracle Explainers On Prediction Markets

OPEN LETTER TO THE COMMENTERS OF THE MARGINAL REVOLUTION BLOG

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Hello Professor Tyler Cowen and all the commenters,

#1. Professor Lance Fortnow made a specific point: taken one day before Election Day, the TradeSports&#8217-s prediction markets of the individual races for the US Senate were accurate (provided that Virginia and Montana go democratic).

#2. Professor Lance Fortnow DID NOT SAY that the TradeSports&#8217-s prediction market for the control of the US Senate was accurate. Please, don&#8217-t put words in his mouth.

#3. Analysis reports from economists and statisticians are coming, but, please give them time to digest the data&#8230- once the dust has settled.

Thanks for your attention,

Chris Masse