DataTerminology.comNEW
A single, atomic unit of information or observation within a dataset.
DESCRIPTION
A datum is the singular form of data, representing one measurement, fact, or observation. In data modeling, a datum often maps to a value for an attribute within a record. Datums aggregate into datasets used for analysis, reporting, and machine learning. Clear definitions and metadata improve the interpretability and quality of collected datums. Understanding the granularity of a datum helps ensure correct aggregation and statistical inference.
ALTERNATIVE DEFINITIONS
Wikipedia
In computing, data is information that has been translated into a form that is efficient for movement or processing.
Provides context for data as a collection of datums in computing.
NIST
A representation of information in a formalized manner suitable for communication, interpretation, or processing.
Formal definition emphasizing representation and processing aspects.
RELATED TERMS
Data Tuple State Attribute Feature Measurement Metadata
COMPETING TERMS
KNOWLEDGE AREAS
Data Management Data Modeling Domain & Business Context
TARGET AUDIENCE
Data Analyst Data Steward Data Modeler Data Scientist Data Architect
EXTERNAL SOURCES
- Wikipedia - Data (computing)
- NIST - NIST glossary entry for data
- ISO/IEC 2382 - Information technology—Vocabulary
TOP QUESTIONS
What is a Datum in data analysis?
It is a single observed value, like a temperature reading or a transaction amount, within a dataset.
Category: Basics
Why does the distinction between Datum and Data matter?
Clarity on granularity helps define aggregation logic, deduplication, and statistical inference correctly.
Category: Relevancy
How is a Datum represented in databases?
Typically as a value in a field (attribute) of a row (record) in a table or document.
Category: Implementation
What metadata should accompany a Datum?
Data type, unit, timestamp, source, and quality flags improve interpretability and governance.
Category: Best practices
What is a common mistake with Datums?
Mixing units or formats without metadata leads to incorrect aggregations and analysis.
Category: Mistakes
How do Datums aggregate into insights?
By applying statistics, grouping, and transformations across many datums to extract patterns and trends.
Category: HowTo
What risks exist with poor-quality Datums?
Downstream metrics become unreliable, causing flawed decisions and model drift.
Category: Risks
What is the origin of the word Datum?
From Latin ‘datum’ meaning ‘something given’; in English it’s the singular of ‘data’.
Category: History
Where to learn more about data definitions?
Consult NIST glossaries, ISO vocabularies, and enterprise data dictionaries.
Category: Resources