Overall in major sports, do the lines tend to move higher or lower from the opener?

[TheCentaur]

I realize this varies greatly on a game by game basis, but if you analyzed all the games is there a meaningful trend towards a line increase, decrease, or staying the same?

[jjgold]

It seems to go up but no data on it

I would say 60% go up

[BuddyBear]

money tends to show on the dog more than anything else.

[TheCentaur]

money tends to show on the dog more than anything else.

So you're saying they tend to go down then