Data Cleaning Exercises

Dataset pack

Customer loyalty tiers

Customer tiers typed by account managers, including an abbreviation for platinum.

Fictional data · UTF-8 CSV, every value quoted so padding and leading zeros survive; empty fields are missing values · free for personal and classroom practice · practise it in Derive a flag from a category list.

customers 16 rows × 2 columns

Download customers.csv (Pro)

Data dictionary

id
Unique customer ID.
tier
Loyalty tier as typed.

Values are shown in quotes so leading and trailing spaces are visible. ∅ means the cell is missing. Exercises are also graded on hidden datasets that are never published.