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Change Log

Control Charts + Outlier Detection (IQR + Percentile-Based)

27 May

2025

We’ve added a control chart to visualize outliers and performance variation in PR Coding Time (first commit → PR creation).

‍How it works:

  • Each point = a unit (e.g. week or team)
  • Blue line = moving average over time
  • Outliers plotted at top/bottom
  • Bands show:
    • UCL / LCL (95th / 5th percentile)
    • Goal (75th), Mean (50th), Median (25th)

Why it matters: Averages can look good even when the spread is bad. This chart shows when:

  • Some PRs are taking way longer to code than expected
  • Specific teams/weeks are pulling the curve up or down
  • Your process has inconsistent behavior hiding behind a decent mean

Where to find it: Velocity → PR Coding Time → Toggle to chart view Break down by team, repo, or day/week granularity

Use it to:

  • Investigate workflow anomalies
  • Catch delivery risks early
  • Identify which teams or repos cause the most volatility

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