Data Cleaning Exercises

Dataset pack

Auction bids

Bids on auction lots placed from several time zones, including equal bids.

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 Pick the winning bid.

bids 14 rows × 4 columns

Download bids.csv (Pro)

Data dictionary

bid_id
Unique bid ID.
lot
Lot code as typed.
amount
Bid amount as text.
placed_at
Bid time, ISO 8601 with offset.

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.