What is the Bias Score and how is it calculated?

The Bias Score compares a team's win rate under a specific referee to their baseline win rate (45%). A negative score suggests the team performs worse than average under that referee.

What sample size is considered reliable?

We recommend at least 5 games for initial patterns and 10+ games for high confidence.

← Back to Home•View All Teams for L Mason →•View All Referees for Portsmouth →

🧑‍⚖️ Referee Analysis⚠️ BIAS DETECTED

L MasonvsPortsmouth

Analysis based on 5 matches since 2000

* Note: Detailed card statistics for matches before 2005 may be incomplete.

Wins

Draws

Losses

When L Mason officiates Portsmouth matches, the statistics reveal a severe negative pattern. Based on 5 matches spanning multiple seasons, our comprehensive analysis shows Portsmouth achieves a 20% win rate under L Mason, compared to the 45% baseline expected for teams at this level. This negative 25.0 percentage point difference suggests a meaningful pattern worth examining. The data includes detailed card statistics, match outcomes, and historical trends to provide football fans, bettors, and analysts with evidence-based insights into this referee-team dynamic.

🚨STRONG BIAS DETECTED

🚨 STRONG BIAS DETECTED

This referee has a significantly negative history with this team. Win rate is severely below average.

Bias Score

-25.0%

Matches Analyzed

⚠️

Notable Negative Pattern

With a bias score of -25.0%, this ranks among the more significant negative patterns in our database. Over 5 matches, Portsmouth has won 25 percentage points fewer games than expected. For bettors and fantasy managers, this historical trend suggests extra caution when L Mason is appointed.

The Bias Meter™

Bias Level-25.0%

Bias AgainstNeutralFavorable

Match History

5 matches under this referee

Date	Opponent	Score	Result	Cards	Division
24 Mar 2010	Chelsea(H)	0 - 5	LOSS	🟨 3	Premier League
6 Feb 2010	Man United(A)	0 - 5	LOSS	🟨 4	Premier League
19 Dec 2009	Liverpool(H)	2 - 0	WIN	🟨 3	Premier League
2 May 2009	Arsenal(H)	0 - 3	LOSS	🟨 3🟥 1	Premier League
9 Apr 2007	Watford(A)	2 - 4	LOSS	—	Premier League

Frequently Asked Questions

Detailed Statistics

Win Rate (Under Ref)20.0%

Baseline Win Rate45%

Bias Score-25.0%

Cards for Portsmouth

🟨 Yellows / Game2.60

🟥 Reds / Game0.20

Cards for Opponents

🟨 Opp Yellows / Game1.40

🟥 Opp Reds / Game0.20

💰

Betting Outlook

TIPSTER INSIGHT

🟥

RED CARD RISK

Red card frequency: 0.2 per game

Higher than average dismissal rate in this matchup.

⚠️ This is statistical analysis, not betting advice. Gamble responsibly.

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