Advanced analysis

Anomaly Detection

Flag unusual days with weekday-aware, outlier-resistant statistics.

Anomaly Detection in GSC Wizard flagging unusual days in Google Search Console traffic with confidence bands
Anomaly Detection (example data).
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The tool uses a robust measure (based on the median absolute deviation) and compares each day against its own weekday, so a normal weekend dip is not mistaken for a problem. A day must be both statistically extreme and at least a 10% deviation to count. Needs at least 21 days.

What you get

  • Metric choice (clicks, impressions, CTR, position) and a sensitivity slider (1.0–4.0, default 2.5).
  • Summary cards and a confidence-band chart with severity-coloured anomaly dots.
  • A sortable anomaly table (deviation %, z-score, severity) and a collapsible EWMA control chart for small persistent shifts, plus export.

Part of Advanced analysis. Related: Time-Series Decomposition, Change Point Detection.

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