The underperformance totals for each team are compared to account for pitch and weather conditions. The side with the highest total is deemed to have underperformed by the difference in totals between the two sides. Of course, no statistical model can perfectly predict that a match is fixed. None of the rankings, nor assessments of player performance, should be taken to infer their involvement in match-fixing or attempting to alter in a negative way the course of a game. Because, on the evidence produced by inquiries so far, individual players, or small groups tend to be responsible for attempting to alter the course of a game.
Any player can have a bad day.
Although we look at each player, it is the number of players who perform poorly which generates a high total. My favourite team features high in the index. The index points out teams that have performed drastically differently in one match from those before and after it. Match-fixing is only one possible explanation for that difference. Let us know what you think of the Match Fixing Index.