Datasets
A collection of practice datasets covering the full analytics workflow: clean CSVs with known answers for structured exercises, deliberately messy data for cleaning and wrangling practice, and simulated A/B test result sets with built-in ground truth. Each dataset ships with a key documenting its true parameters, so you can check your work against the real values.
Inside the Brightcart Club Dataset: How I Built a Deliberately Messy Churn File
Most teaching datasets are too clean. Here is how I built the Brightcart Club churn file with planted duplicates, three kinds of missing data, and a deliberate leakage trap.
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