4.6. Chapter Exercise#
Apply the key ideas from this chapter in the connected task below. Work in your own notebook or local project. Keep your implementation, reasoning, and verification results together.
4.6.1. Build a reconciled data report#
Load a real chapter dataset, record its source and any supplied revisions, and inspect rows, columns, labels, and dtypes.
Select and clean a justified subset, choose a missing-value policy, and combine or group records to answer a concrete question.
Check unmatched join keys, duplicate records, and missing values. Reconcile row counts and grouped totals with independent controls and explain how index alignment differs from row position.
Return to the chapter lessons as needed: Pandas Series, Handling Datasets, DataFrames, Missing Data, Data Operations.