01 / 06
Is the difference between customer groups real?
The apparent 0.42-point gap fell to 0.07 once partial responses were included.
- 1,840
- 71.2%
- 2
Customer survey, Q2 · 2 files · 1,857 rows
Open case studyData quality examples
Projects where the finding was in how the data was collected: duplicate records, abandoned surveys, and one headline rate that was three events added together.
6 of 11 · Data quality
See all examples02 / 06
What actually changed between these budget versions?
Contractor spend rose $412,000 while headcount spend fell $448,000, leaving only a $4,000 net change.
- -$4,000
- 63
- 3
Budget v1 vs v4 · 2 files · 441 rows
Open case study03 / 06
Why does donor retention look worse than it is?
5,510 people were stored as 6,214 records, depressing reported retention by 10.9 points.
- 58.1%
- 5,510
- 52.0%
Donor file, FY2023 to FY2026 · 3 files · 24,680 rows
Open case study04 / 06
Why is our no-show rate 22%?
The 22.4% rate combined three different events; the unrecovered no-show rate was 11.4%.
- 11.4%
- 24.00
- $340,000
Appointment book, January to June · 3 files · 26,066 rows
Open case study05 / 06
Is the menu as profitable as the recipe cards say?
Fourteen-month-old recipe cards overstated the menu's margin by 6.1 points (64.5%, not 70.6%), and nine dishes were selling below cost.
- 64.5%
- $78,168
- 3
Product mix and recipe costs, January to June · 3 files · 68,892 rows
Open case study06 / 06
How many orders did our ad platforms actually drive?
Three platforms claimed 8,412 conversions but described 4,318 orders. 2,580 of the claims were the same order counted again.
- $92.26
- 1,514
- $60,519
Ad exports and orders, January to June · 4 files · 15,737 rows
Open case study
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