PA
Plate Appearances
Completed trips to the plate recorded by NJ.com.
Source totalDiamond Index · Reference
Glossary
Plain-language definitions and the exact formulas used across Diamond Index.
Documented metrics58
Metric guide
17 metricsBatting · Standard
Traditional offensive counting and rate statistics.
AB
At-Bats
Plate appearances that count as official at-bats.
Source totalH
Hits
Singles, doubles, triples, and home runs.
1B + 2B + 3B + HR1B
Singles
Hits that result in one base.
H − 2B − 3B − HR2B
Doubles
Hits that result in two bases.
Source total3B
Triples
Hits that result in three bases.
Source totalHR
Home Runs
Hits on which the batter scores without another play.
Source totalR
Runs
Times the player scores.
Source totalRBI
Runs Batted In
Runs credited to the batter’s plate appearance.
Source totalBB
Walks
Bases on balls.
Source totalHBP
Hit By Pitch
Times reaching base after being hit by a pitch.
Source totalSB
Stolen Bases
Successful stolen-base attempts.
Source totalAVG
Metric guide
7 metricsBatting · Advanced
Diamond Index run-value and league-adjusted hitting statistics.
ISO
Isolated Power
Extra bases per at-bat beyond batting average.
SLG − AVGwOBA
Weighted On-Base Average
Values each way of reaching base by its estimated run impact.
[0.7×(BB+HBP) + 0.9×1B + 1.3×2B + 1.6×3B + 2.0×HR] ÷ PAwRAA
Weighted Runs Above Average
Estimated batting runs above or below the selected league baseline.
[(wOBA − league wOBA) ÷ 1.12] × PAwRC
Weighted Runs Created
Estimated total runs created.
wRAA + 0.177×PAwRC+
Weighted Runs Created Plus
Run creation indexed to league average. 100 is average; 120 is 20% above average.
{[(wOBA − league wOBA) ÷ 1.12 + 0.177] ÷ 0.177} × 100BsR
Baserunning Runs
A simple Diamond Index estimate of value from steals and triples.
0.2×SB + 0.1×3BOff
Offensive Runs
Total hitting and baserunning value above average.
wRAA + BsRMetric guide
9 metricsPitching · Standard
Traditional pitching workload and result statistics, scaled to seven-inning high-school games.
IP
Innings Pitched
Total innings recorded by the pitcher.
Source totalH
Hits Allowed
Hits surrendered while pitching.
Source totalR
Runs Allowed
All runs scored while the pitcher was responsible.
Source totalER
Earned Runs
Runs charged as earned.
Source totalBB
Walks Allowed
Bases on balls issued.
Source totalHBP
Hit Batters
Batters hit by a pitch.
Source totalSO
Strikeouts
Batters retired by strikeout.
Source totalERA
Earned Run Average
Earned runs allowed per seven innings.
ER ÷ IP × 7WHIP
Walks and Hits per Inning
Average walks plus hits allowed per inning.
(BB + H) ÷ IPMetric guide
7 metricsPitching · Advanced
Rate, defense-independent, and league-indexed pitching measures.
K/7
Strikeouts per Seven
Strikeouts per seven innings.
SO ÷ IP × 7BB/7
Walks per Seven
Walks per seven innings.
BB ÷ IP × 7K/BB
Strikeout-to-Walk Ratio
Strikeouts for every walk issued.
SO ÷ BBFIP
Fielding Independent Pitching
Estimates run prevention from walks, hit batters, and strikeouts using the site’s high-school formula.
[3×(BB + HBP) − 2×SO] ÷ IP + 3.10ERA−
ERA Minus
ERA indexed to the site baseline. 100 is average and lower is better.
ERA ÷ 3.00 × 100FIP−
FIP Minus
FIP indexed to the site baseline. 100 is average and lower is better.
FIP ÷ 4.31 × 100PIT
Pitching Runs Above Average
Estimated runs saved relative to a 3.00 ERA baseline.
(3.00 − ERA) ÷ 7 × IPMetric guide
9 metricsTeams & Rankings
Opponent-adjusted team strength and standings metrics.
W–L–T
Record
Wins, losses, and ties.
W–L, or W–L–T when ties existWin%
Winning Percentage
Share of possible wins earned; a tie counts as half a win.
(W + 0.5×T) ÷ (W + L + T)RF
Runs For
Runs scored across resolved games.
Sum of team runsRA
Runs Against
Runs allowed across resolved games.
Sum of opponent runsDiff
Run Differential
Scoring margin across the season.
RF − RAAdjO
Adjusted Offense
Estimated runs per seven innings against an average New Jersey defense.
Iterative opponent adjustment of runs scored; regressed by five league-average gamesAdjD
Adjusted Defense
Estimated runs allowed per seven innings against an average offense. Lower is better.
Iterative opponent adjustment of runs allowed; regressed by five league-average gamesSOS
Strength of Schedule
Average raw opponent rating across the team’s schedule.
Mean opponent ratingDI
Diamond Index Score
Opponent-adjusted team quality on a 1–99 scale, with 50 at statewide average.
clamp[50 + 18×z(opponent-adjusted rating), 1, 99]Game margins use sign(margin)×log₂(1+|margin|), a 0.18-run home adjustment, 100 rating iterations, and a three-game prior.Metric guide
2 metricsStandings & Sections
Conference placement and projected NJSIAA tournament seeding values.
Division Record
Division Record
Wins, losses, and ties against teams in the same conference division.
Division W–L–TPower Pts
Projected NJSIAA Power Points
Projected tournament-seeding average from the team’s best 16 game values.
sum(best 16 game Power Points) ÷ 16Game Power Points = (Quality + Residual) × OOWP. Win quality = 6; tie = 3. Win residual = 3×opponent wins; loss residual = opponent wins−1; OOWP = .500 + opponent-opponents’ average Win%.Metric guide
7 metricsProfiles, Scores & Predictor
How comparisons, game quality, and projected outcomes are produced.
Percentile
Percentile Ranking
The percentage of qualified New Jersey players at or below the player’s value; lower-is-better pitching stats are reversed.
round[(below + 0.5×equal) ÷ qualified pool × 100]Displayed from the 1st through 99th percentile. Hitting qualification is 50 PA; pitching is 15 IP.Game Score
Completed Game Quality
Blends team quality, matchup balance, and final-score closeness.
0.72×Matchup Quality + 0.28×ClosenessMatchup Quality
Matchup Quality
Rewards strong teams and evenly matched opponents.
0.72×mean(DI scores) + 0.28×max[0, 100 − 1.35×|DI difference|]Closeness
Game Closeness
Rewards small final margins.
max[0, 100 − 14×run margin]Projected Runs
Neutral-Field Projected Runs
Combines one team’s adjusted offense with the opponent’s adjusted defense.
team AdjO × opponent AdjD ÷ statewide mean AdjOProjected means are limited to 0.35–18 runs.Win Probability
Win Probability
Probability one independent Poisson run distribution outscores the other; half of tie probability goes to each team.
P(A>B) + 0.5×P(A=B)Run Distribution
Projected Run Distribution
Probability of each team scoring exactly 0–11 runs, with 12+ combined.
Poisson: P(R=r)=e^(−μ)×μ^r÷r!Method note
Constants and source data
Counting statistics and game results originate with NJ.com. Diamond Index recalculates displayed rate, value, team, percentile, and projection metrics from those inputs. League wOBA is calculated from the selected player pool. Historical career and multi-season rates are recalculated from summed components rather than averaging season rates. NJSIAA Power Points follow the current published procedure.