There are so many factors that go into setting and changing a betting line. However, what are some factors that will never affect your betting line? For starters a line cannot change in the middle of a period or quarter.
Although betting lines change as the game progresses, they will rarely change during the actual change. Sports betting can be very tricky especially when under a time constraint. Many sports books are unable to change their lines until a break in play whether they be at half time or during intermissions. Finally, the non-starting players never affect a betting line. It is simply too hard to keep track of practice squads for many online and offline bookies.
Check out more online sports books for more articles on what defines and changes a betting line as well as what sets a betting line in the first place.