Data Cleaning Exercises

Dataset pack

Self-reported timesheets

Task times typed by staff from memory, heaping on round numbers.

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 Round numbers are often estimates.

timesheets 20 rows × 3 columns

Download timesheets.csv (Pro)

Data dictionary

id
Unique entry ID.
task
Task name.
minutes
Minutes spent as text.

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.