To be more precise:
1/2 = ((Pts in games 12-22) - (Pts in games 1-11)) / 22
Team Rec, 1-11 Rec,12-22 Pts Dif 1/2
Clarkson 7-4-0 10-1-0 +6 +.273
Brown 1-9-1 3-7-1 +5 +.227
Union 5-5-1 6-3-2 +3 +.136
Cornell 6-3-2 8-3-0 +2 +.091
Vermont 7-4-0 6-2-3 +1 +.045
Harvard 4-5-2 5-6-0 0 .000
Yale 3-7-1 3-7-1 0 .000
St. Lawrence 3-6-2 2-6-3 -1 -.045
Colgate 6-4-1 4-5-2 -3 -.136
RPI 7-3-1 5-4-2 -3 -.136
Dartmouth 4-7-0 1-8-2 -4 -.182
Princeton 7-3-1 4-5-2 -5 -.227