Several factors influence a point spread. It starts with power rankings. The media creates power rankings throughout the year, but those can be entirely subjective based more on feelings and emotions than actual raw data. An oddsmaker creates power rankings based on a host of statistics, some more complex than others. The rankings will include record, strength of schedule, and various offensive, defensive, and special teams metrics. They might use Football Outsiders’ efficiency metrics, they might use expected points added, or they might use a host of other internal and external options. The idea being to develop as objective an assessment as possible as to how good or bad a given team is compared to the rest of the NFL.
It is important to note the difference between spreads in sports wagering in the U.S. and sports spread betting in the UK. In the U.S. betting on the spread is effectively still a fixed risk bet on a line offered by the bookmaker with a known return if the gambler correctly bets with either the underdog or the favourite on the line offered and a known loss if the gambler incorrectly bets on the line. In the UK betting above or below the spread does not have a known final profits or loss, with these figures determined by the number of unit points the level of the final outcome ends up being either above or below the spread, multiplied by the stake chosen by the gambler.
Because the spread is intended to create an equal number of wagers on either side, the implied probability is 50% for both sides of the wager. To profit, the bookmaker must pay one side (or both sides) less than this notional amount. In practice, spreads may be perceived as slightly favoring one side, and bookmakers often revise their odds to manage their event risk.
Wagering on the NFL revolves around the point spread in which one team is designated the favorite and the other team is called the underdog. The NFL point spread sets a specific number of points that the favorite must win by in order for a person betting that particular team to win their wager. Lets use an example from last week's NFL slate to demonstrate the art of NFL point spreads. This past weekend the New England Patriots played the Seattle Seahawks. The Patriots were four point favorites in that game. So in your local newspaper, you might have seen something similar to this illustration.
In-play betting. In-play betting is a fairly new feature offered by some online sports books that enables bettors to place new bets while a sporting event is in progress. In-play betting first appeared towards the end of the 1990s when some bookmakers would take bets over the telephone whilst a sports event was in progress, and has now evolved into a popular online service in many countries. The introduction of in-play betting has allowed bookmakers to increase the number of markets available to bet on during sports events, and gamblers are able to place bets based on many different types of in-game activity during the matches. For example, in football matches, it is possible to bet in on in-play markets including the match result, half-time score, number of goals scored in the first or second half of the game, the number of yellow cards during the match, and the name of the goal scorers.  The availability of a particular sport and in-play markets varies from bookmaker to bookmaker. In-play sports betting has structural characteristics that have changed the mechanics of gambling for sports bettors, as they are now able to place a larger number of bets during a single sports game (as opposed to a single bet on who is going to win). One of the most important differences between being able to place an in-running sports bet opposed to a pre-match bet is that the nature of the market has been turned what was previously a discontinuous form of gambling into a continuous one. The gambling study literature has suggested that in-play sports betting may offer more of a risk to problem gamblers because it allows the option for high-speed continuous betting and requires rapid and impulsive decisions in the absence of time for reflection. There are three different types of in-play sports betting products(cash out, Edit my Acca, and Edit my Bet).
So the sportsbooks and bookies created a point spread to make both teams equally attractive in the eyes of bettors. Carolina was installed as a 6-point favorite, which is commonly written as Carolina -6. Denver, the underdog, is commonly written as Denver +6. In other words, Denver would be credited with whatever points they actually scored — plus six. If you bet the favorite, the Panthers would have to win by 7 points or more for you to win your wager. And remember, the Panthers are favored by 6 points, so we have to subtract 6 points from their final score for betting purposes.
Point spreads are used since most recreational bettors prefer to wager even money propositions. In the above example, if there was no point spread, only moneyline betting would exist. So, if odds makers are giving the New England Patriots a 73% chance of winning a game, then in order to take bets and still have a small profit margin, the bookmaker would have no choice but to require Patriot bettors to stake $3.00 or more for each $1.00 they want to win.
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