How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 9/30100.0*Chance in playoffs100.0*Average seed
New York 2 Pittsburgh 0 -5.4
-0.5
Harrisburg 2 St Louis 0 +0.5
Tampa Bay 1 Bethlehem 1 -0.2
Richmond 0 Orlando 1 Out
Ottawa 1 Charleston 1 +0.1
Week of 10/7100.0*Chance in playoffs100.0*Average seed
Pittsburgh 0 Rochester 2 -0.6
St Louis 0 Richmond 1 +0.3
Charleston 4 Harrisburg 0 +0.2
Ottawa 4 Cincinnati 0 -0.1
Week of 10/14100.0*Chance in playoffs100.0*Average seed
Pittsburgh 1 Ottawa 1 -0.8
Bethlehem 1 St Louis 1 -0.5
Louisville 3 Richmond 1 +0.0
Points
Chance Will Make Playoffs