Debug the GroupBy Surprise
Diagnose a groupby issue by distinguishing split keys, aggregation, transformation, filtration, and null-key behavior.
Missing groups A groupby summary dropped accounts after a new reseller channel arrived with blank region values. The risk is treating unknown region as absent customers. Split-apply-combine Split keys, apply type, combined shape GroupBy is clear when you can say what each phase is doing and what shape should come back. Just aggregate Run the summary and inspect the chart. The result explains what changed instead of hiding missing groups. Before fixing a grouped result, name the split key, operation type, and expected output shape. 01 Split 02 Apply 03 Reconcile Null keys The account count is lower only after…
Sign up free — one personalized lesson every day, matched to your role and goals.
Already have an account? Sign in