Event Density Anomaly Detector(4.2.9)

Most weeks, the total volume of events across the portfolio fluctuates within a predictable range. When a week's total activity sits well outside that range, beyond the statistical control limits, something happened across the portfolio at the same time. That could be a major deployment, a regulatory deadline, a reorganization, or simply more people, and it is worth understanding which.

What you can conclude

• A week flagged as an anomaly is a week whose volume left the range the rest of its history sets. The question it raises is what drove activity across all projects at once.
• Consecutive flagged weeks show volume staying outside that range, on one side or the other. Whether that reflects pressure, growth, or a change in how work is recorded is the next question to ask.
• A portfolio that stays within the control limits is moving within the range its own history sets. That is a statement about volume, not about quality or governance.

How this chart works

Control chart showing portfolio-wide weekly event count with the mean and plus-or-minus two-standard-deviation control limits computed over every complete week the workspace has sent events, not over a fixed recent window—so a quiet stretch early in the history keeps widening the band long after it ends. A week outside either limit is marked. The lower limit is drawn only where two standard deviations below the mean is above zero; on a series whose week-to-week spread is more than half its mean that bound falls below zero, no event count could ever reach it, and the chart shows no lower limit rather than a line at zero. The band is computed in absolute event counts, so it moves when the portfolio itself changes: onboarding projects, adding contributors, or retiring a project shifts the mean, and the weeks following such a change can fall outside the limits for that reason alone. Read a flagged week against what changed in the organization before reading it as a signal.

The week in progress is shown at its value so far. Because the week is not yet complete, it covers only the events recorded so far and can move in either direction as the week closes.