Variance trend

Average days off plan per month, one line per crew, around a zero rule — a line falling toward zero is a crew getting back on schedule.

What it is

The did-it-work chart. Months are bucketed from the stage's actual end date (or its planned end when there is none). The tooltip lists each crew's value with its sample size and adds a sentence naming who lost the most ground that month — or, when a crew is selected, whether that month finished ahead, behind or exactly on plan.

Also called: are we getting better · monthly schedule trend · improving or slipping · trend over time · is the crew improving · monthly variance

See it
Variance trend
Apr
May
Jun
Jul
Delia Yoder — Equipment Storage
Framing
Sutter Kline — Hobby Shop
Concrete
Ronan Petsch — Barndominium
Trim
Sutter Kline — 30×40 Garage
Framing
Sutter Kline — Hobby Shop
Concrete
Framing crewConcrete crewTrim crew
'Variance Trend' — monthly lines per crew crossing a zero rule, tooltip listing '+1.4d · n=6' per crew plus 'Framing Crew B lost the most ground this month.' FieldPerformance.tsx. Sample data — no customer information appears here.
How it works
  1. 1Completed stages are grouped by year-month and crew, and averaged.
  2. 2A ReferenceLine at y=0 anchors the chart; ticks carry explicit signs.
  3. 3Rendered only when there is more than one month of data.
  4. 4connectNulls keeps a crew's line continuous across a month it did not work.
Why we built it

The panel hint states the reading instruction: 'A line falling toward zero is a crew getting back on schedule.' The footnote logic exists because a manager's next question after 'who' is always 'is it improving'.

The problem
  • Performance was only ever a snapshot, never a direction.
  • Improvement after a coaching conversation could not be evidenced.
Sound familiar?
What you get
Change over time is visible, so interventions can be judged.
Each month's point carries its sample count.

See it on your own jobs

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