Batter Rolling wOBA & Hard Hit Rate

Overview

This pillar analyzes MLB hitters by tracking rolling weighted production and contact quality rather than traditional box score stats. By combining rolling wOBA with Hard Hit rates, it separates sustainable hot streaks from luck-driven performance to predict player output.

What It Does

The system tracks every plate appearance to calculate a 14-day and 30-day rolling weighted On-Base Average (wOBA) for projected starters. Simultaneously, it overlays Statcast Hard Hit data to verify if production is backed by strong exit velocity. This dual-layer analysis filters out 'cheap' hits and identifies batters making genuine, high-quality contact.

Why It Matters

Standard batting average is noisy and slow to react to changes in skill or health. Rolling wOBA is more predictive of future runs created, while Hard Hit rate acts as a leading indicator for power output, offering a significant edge in player prop markets like Total Bases and Home Runs.

How It Works

First, recent game logs are ingested to compute weighted run values for all hitting events based on current season linear weights. Second, Statcast data is cross-referenced to measure exit velocities for batted balls. Finally, the system compares current rolling averages against the player's seasonal and career baselines to flag positive or negative regression candidates.

Methodology

Calculates wOBA using current season linear weights (BB, HBP, 1B, 2B, 3B, HR) excluding errors. Rolling windows are set to 50 plate appearances (~14 days) and 100 plate appearances (~30 days). Hard Hit Rate is defined as the percentage of batted balls with Exit Velocity ≥ 95 mph. Divergence analysis compares Expected wOBA (xwOBA) to actual wOBA to quantify 'luck' variance.

Edge & Advantage

Identifies 'buy-low' candidates hitting the ball hard but finding fielders, and 'sell-high' candidates relying on low-probability hits, providing an ROI advantage on player prop lines before oddsmakers adjust.

Key Indicators

• Rolling 14-Day wOBA

  high

  Weighted on-base average over the last 50 plate appearances, emphasizing recent form.

• Hard Hit %

  high

  Percentage of batted balls with exit velocity ≥ 95 mph.

• xwOBA - wOBA Diff

  medium

  The difference between expected and actual results; indicates luck regression.

Data Sources

• MLB Statcast

  Official ball-tracking technology providing exit velocity and launch angle.

• FanGraphs

  Source for seasonal linear weights and wOBA constants.

Example Questions This Pillar Answers

• → Will Aaron Judge record Over 1.5 Total Bases in tonight's game?
• → Will Shohei Ohtani hit a Home Run against the Dodgers?
• → Which player is most likely to record a hit in the Yankees vs Red Sox game?

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