Computer science · University
Data quality and cleaning · revision notes
An observation where a required measurement is absent.
Key ideas and conditions
Missing value
An observation where a required measurement is absent.
Outlier
An observation unusually far from the main pattern and requiring contextual review.
Data type
The representation and allowed operations for a variable.
Validation rule
A stated condition used to check whether data are plausible or acceptable.
Explain without looking
- Give a short example showing how Data type would be used in practice.
- Summarize why Validation rule matters in the lesson “Data quality and cleaning”.
Further reading and review references
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