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# Odds

In probability theory and statistics the odds in favor of an event or a proposition are the quantity p/(1 − p), where p is the probability of the event or proposition. The logarithm of the odds is the logit of the probability.

Odds have long been the standard way of representing probability used by bookmakers, though the method of presenting odds varies by location.

Taking an event with a 1 in 5 probability of occurring (i.e. 0.2 or 20%), then the odds are 0.2/0.8=0.25. If you bet 1 at fair odds and the event occurred, you would receive back 4 plus your original 1 stake. This would be presented by a British bookmaker as odds of 4 to 1 against (written as 4/1), by a European bookmaker as 5.0 to include the returned stake, and by an American bookmaker as +400 representing the gain from a 100 stake.

By contrast, for an event with a 4 in 5 probability of occurring (i.e. 0.8 or 80%), then the odds are 0.8/0.2=4. If you bet 4 at fair odds and the event occurred, you would receive back 1 plus your original 4 stake. This would be presented by a British bookmaker as odds of 4 to 1 on (written as 1/4), by a European bookmaker as 1.25 to include the returned stake, and by an American bookmaker as −400 representing the stake necessary to gain 100.

The odds are a ratio of probabilities; an odds-ratio is a ratio of odds, i.e., a ratio of ratios of probabilities. Odds-ratios are often used in analysis of clinical trials.

Who Covers
Offers handicapping tools and information, free picks, power ratings, team notes, betting essays and message boards.
http://www.whocovers.com

Bettorstalk
Portal with free handicapper and service plays, gambling forums, contests and sports news.
http://www.bettorstalk.com/

LoFFT Prediction League
E-mail based prediction league based on the English Premiership.
http://www.lofft.freeserve.co.uk/

Swirve
Free fantasy sports. Compete against other players worldwide and predict the games winner to win prizes.
http://www.swirve.com/

Sports Insights
Sports news, scores, links and tips for gamblers.
http://www.sportsinsights.com

Betfair
Open-market betting company that allows customers to make their own odds in order to transact with each other at mutually beneficial levels.
http://www.betfair.com

4 to 1
Explains how to bet in simple terms, providing daily news, tips and advice on a range of different global sports and events.
http://www.4to1.com/

Dirty Dawg
Free football and basketball contests with the twist of heavily weighting the scoring based on a player's confidence.
http://www.dirty-dawg.com/

Bet Brain
Global bookmaker odds, comparisons and best winning chances from over one hundred leagues and dozens of bookmakers.
http://www.betbrain.com

Tip n Win
Tip the winners of sporting events and win various prizes.
http://www.tipnwin.com

Sochoc
Internet gambling site for hockey and soccer fans. The fixtures, games or matches are chosen from around the world.
http://www.sochoc.com/

On the Punt
Gives the latest betting information, news, odds and sport analysts with selections for each event.
http://www.onthepunt.com.au

StatFox
Featuring trends, statistics, match-ups, lines, systems, scores, power ratings and message boards for all major sports.
http://www.statfox.com/

Frank Rosenthal
Picks, odds, scores and sporting news for all major sports.
http://www.frankleftyrosenthal.com/

Gamingsleuth
Provides daily sports picks, odds, scores, game day matchups, headline news and football parlays.
http://www.gamingsleuth.com/

Jim Barnes Sports
Veteran commentary and free projected scores on daily major sports games.
http://www.jimbarnes.com/

Freesportsplay.com
Offers prizes for in-season score predicting games. All major sports covered. Winnings can be used to help charity too.
http://www.freesportsplay.com/

Bravo Pools
Providing weekly coupons on soccer matches from around the world. Use your knowledge of football to forecast winners.
http://www.bravopools.com/

Fantasy FA Cup
Free game predicting the results of matches in the FA Cup.
http://www.fantasyfacup.com/

Sunshine Forecast
Football newsletter, offering free selections and historical score, lines and betting systems.
http://www.repole.com/sun4cast/

City Index
Real-time sports and financial market information in a customizable java-based format.
http://www.cityindex.co.uk

Sportspic
Gambling and sportsbook guide.
http://www.sportspic.com

Kennedy Letter
Free daily picks and odds on baseball, football, basketball, boxing and horse racing.
http://kennedyletter.com

Phoenix Sports
Site features discussion forum, live scoreboard and nightly chat with guest cappers.
http://www.phoenixsports.com/

NBA Worldwide
Daily guide to NBA, WNBA and NCAA news, stats, scores, terminology, rosters and history.
http://www.nbaworldwide.com/

Soccer Prediction
Site offering free picks and soccer information.
http://home-4.tiscali.nl/~t468243/predict/

The Insider
Sports betting advice from independent odds compiler. Written from a British angle.
http://www.sportinginvestor.co.uk/

Sports Punter
Statistics and odds comparison service. Prediction competitions also available.
http://www.sportspunter.com/

Oddschecker
Free online betting odds comparison site.
http://www.oddschecker.com/

Every Edge
Articles, gaming information, forums and picks.
http://www.everyedge.com/

Napit
Predication games, members forum and a variety of sports information.
http://www.napit.co.uk/

Odds Exchange
Service providing real time information on changes that occur in the betting world.
http://www.oddsexchange.com/

Index Betting
Explains the concept of spread betting.
http://www.indexbetting.net/

Sports Betting Information
Condenses major sports league statistics into chart form.
http://www.betinf.com/

Best Betting
Compares odds from a range of Internet bookmakers.
http://bestbetting.com/

Sports Betting Stats
Matchup comparisons for professional and college games.
http://www.sportsbettingstats.com/

Calculated Bets
Describes a computer model for successfully predicting the outcome of jai-alai matches.
http://www.jai-tech.com/

Wagerline
Scores, odds, contests and forums for all major sports.
http://www.wagerline.com/

Betbase
Collects and compares soccer odds.
http://www.betbase.info/

Majorwager
Forums, dispute mediation between bookies and bettors, article on offshore rules, and list of blacklisted sportsbooks.
http://www.majorwager.com/

BananaTV - Sports Betting
Online TV talk show discussing betting and gambling tips for various sports competitions and games.
http://www.bananatv.com/default.asp?program=sportsbetting

Soccer Prediction
Picks for Egyptian competitions.
http://www.EgyptSports.com/sp/index.shtml?1

Covers
Industry news, statistics and handicapping selections and betting advice.
http://www.covers.com/

All about sports betting, including tips, game picks and betting resources.

U Can't Lose
Offers sports arbitrage service, with record of recent betting examples from the service.
http://www.ucantlose.co.uk/

Rec.gambling.sports FAQ
Frequently asked questions from usenet newsgroup.
http://www.faqs.org/faqs/gambling-faq/sports/

Spread betting ratings and information for English Premiership and Division I soccer matches.

BookieBusters
Hilarious yet serious look at sports betting and the quest to plunder a bookies wallet.
http://www.bookiebusters.net/

ezPredict.com
Prediction league with prizes and scores and standings updated live. Mostly European soccer matches.
http://www.ezpredict.com/

Providing sports information, message forum, list of links and cappers and free picks.

Winning Line
UK's racing and sports betting advisory service offering direct ownership opportunities in leading racehorses.
http://www.winningline.com/

Insider Sports Report
Offering plays, odds, scores, news and free picks.
http://www.insidersportsreport.com

Bettors World
Provides sports picks, contests and comprehensive offshore sports book information.
http://www.bettorsworld.com/

Sports Chronicles
Documented handicappers, sports scores, lines, odds, news, weather and injury reports.
http://www.sportschronicles.com

Linesheet
Sports betting information, including Las Vegas odds, NFL injury reports, college football and basketball scores and free printable schedules.
http://www.linesheet.com/

Mabels Tables
Soccer statistics odds form prediction for UK football matches on pools and bookmakers coupons.
http://www.mabels-tables.co.uk

Big Guy
Offering sports simulation and monitoring.
http://www.bigguy.com

Clickoff
Predict the winners of the top college and pro football games and compete against other sport fans worldwide to win weekly prizes.
http://www.clickoff.com

Oz Pools
Providing a guide to the UK summer football pools.
http://www.ozpools.ndo.co.uk

Loose Cannon
Sports tipping concentrating on UK flat racing, football and golf.
http://lscannon.8m.com

Provides sports history and handicapping information and links to sportsbook.

Bet Polls
Free to play prediction site covering televised sporting events from around the world including big match spread polls.
http://www.betpolls.com/

The Prescription
Daily articles on the gaming industry, free picks, list of reputable and disreputable sites.
http://www.theprescription.com/

The Bet
An online interactive tool for sports gamblers, providing odds from multiple sources and customizable charts.
http://thebet.com

Informed Soccer Betting
Soccer tipping site featuring the UK's Kulbir Sohi.
http://www.informedsoccerbetting.com/

View the journal of full-time sports speculators and see trades explained and evaluated.

BetOnGames.com
Gives sports fans game analysis, free picks, fantasy advise and college athletics talent guide.
http://www.betongames.com/

The Statman
Win cash by entering a regular season and playoff hockey pool using real NHL players and their stats.
http://thestatman.tripod.com

Wagertracker
Handicapper and contest monitoring software. Also provides various sports information, consensus picks, stats, scores and odds.
http://www.wagertracker.com/

Fantasy Footie
Free fantasy soccer game based on the English Premier League with league tables, stats, general gossip and weekly results via email.
http://www.fantasyfootie.com

Boro Score Forecast
Non-profit making competition with big prizes. Established in 1989. Nominal fee to play.
http://www.boroscoreforecast.co.uk

Italian Soccer Prediction League
Predict the results of the Italian Serie A. Also includes fixtures, standings, polls and news.
http://ispl.nextgen.net.mt

Prediction League
Predict the results of soccer matches and compare your skill against fellow fans. No entry deadline and no limit on numbers.
http://www.predictionleague.co.uk/

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