Correction Factor or QWF for High School
The Correction Factor is employed when a team under performs or over performs relative to
the power rating predictions. The greater the disparity in the actual to predicted
difference increases the amount of correction.
A team receives or loses quality points based on the 'predicted goal difference'
of a game. If a team wins, it gets quality points. If a team loses, it loses
quality points. This is done so that this factor is not unfairly influenced by
the number of games a team plays. The table below explains the number of points.
Here is how to verify the quality points:
(1) Determine who is the favorite team and who is the underdog. The "Reg In" column
on the ratings page lists the power ratings. Note that 'Reg In' only counts games
played within a league (teams listed on each ratings page) and does not count games
played outside a league or state. This Power rating is NOT the same as the total power
rating because that value includes out-of-league games, the Ten Goal Adjustment, the
Win-Loss component and the QWF which is currently being evaluated. Also note that a
team might have a total power rating greater than an opponent, its 'Reg In' value
could be less than an opponent.
(2) Determine the Predicted Goal difference. This value can be found on each team's
page and is listed under Table 2 'Goal Differential' and column 'Predicted.'
(3) Next use the table below to find the correction factor or QWF.
Example: Apex defeats East Chapel Hill 18-10 and earns 0.150 qaulity points.
Apex has a National Power Rating of 79.31 and East Chapel Hill has a national Power
Rating of 75.16. But we don't want the national power ratings because they
are based on all games and other factors. We just want the 'REG IN' power ratings
which are for Apex, 80.60 and East Chapel Hill 76.93. These values were found on
the North Carolina NCHSWLA ratings page. Now if we examine the Apex team page and
go to the second table and look for the East Chapel Hill game, we see that the
Predicted Goal Difference was 4. Since Apex was the favorite and won, we go to
'Winning team was the favorite' below and look for 'Predicted Goal Difference was
= 04' and find the correction (QWF) is 0.15.
Winning team was the underdog:
Predicted Goal Difference was = -01 cor = 0.275
Predicted Goal Difference was = -02 cor = 0.300
Predicted Goal Difference was = -03 cor = 0.325
Predicted Goal Difference was = -04 cor = 0.350
Predicted Goal Difference was = -05 cor = 0.375
Predicted Goal Difference was = -06 cor = 0.400
Predicted Goal Difference was = -07 cor = 0.425
Predicted Goal Difference was = -08 cor = 0.450
Predicted Goal Difference was = -09 cor = 0.475
Predicted Goal Difference was = -10 cor = 0.500
Winning team was the favorite:
Predicted Goal Difference was = 01 cor = 0.225
Predicted Goal Difference was = 02 cor = 0.200
Predicted Goal Difference was = 03 cor = 0.175
Predicted Goal Difference was = 04 cor = 0.150
Predicted Goal Difference was = 05 cor = 0.125
Predicted Goal Difference was = 06 cor = 0.100
Predicted Goal Difference was = 07 cor = 0.075
Predicted Goal Difference was = 08 cor = 0.050
Predicted Goal Difference was = 09 cor = 0.025
Predicted Goal Difference was = 10 cor = 0.000
Winning Team was neither the favorite/underdog:
cor = 0.25
Losing Team was the underdog:
Predicted Goal Difference was = -10 cor = -0.000
Predicted Goal Difference was = -09 cor = -0.025
Predicted Goal Difference was = -08 cor = -0.050
Predicted Goal Difference was = -07 cor = -0.075
Predicted Goal Difference was = -06 cor = -0.100
Predicted Goal Difference was = -05 cor = -0.125
Predicted Goal Difference was = -04 cor = -0.150
Predicted Goal Difference was = -03 cor = -0.175
Predicted Goal Difference was = -02 cor = -0.200
Predicted Goal Difference was = -01 cor = -0.225
Losing Team was the favorite:
Predicted Goal Difference was = 01 cor = -0.275
Predicted Goal Difference was = 02 cor = -0.300
Predicted Goal Difference was = 03 cor = -0.325
Predicted Goal Difference was = 04 cor = -0.350
Predicted Goal Difference was = 05 cor = -0.375
Predicted Goal Difference was = 06 cor = -0.400
Predicted Goal Difference was = 07 cor = -0.425
Predicted Goal Difference was = 08 cor = -0.450
Predicted Goal Difference was = 09 cor = -0.475
Predicted Goal Difference was = 10 cor = -0.500
Losing Team was neither the favorite/underdog:
cor = -0.25
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