Data Cleaning Exercises

Dataset pack

Freezer temperature log

Temperature readings from freezer sensors, including many readings of exactly zero.

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 Zero degrees is a reading.

readings 18 rows × 3 columns

Download readings.csv (Pro)

Data dictionary

id
Unique reading ID.
sensor
Sensor code.
temp_c
Temperature in °C 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.