SECAI Core · phase 3 of 15 · noun

Data scientist

A role that explores data to define a problem, select relevant features, and develop baseline models that demonstrate value

The Explain card

Plain English
A data scientist explores data to frame the problem, chooses the features that matter, and builds baseline models that prove the idea is worth pursuing.
Example
Given months of authentication logs, a data scientist finds that login timing and device changes predict account takeover and builds a first model to show it works.
Why it matters
Data scientists shape what the model learns and often work in notebooks with broad access to sensitive data. Their experiments can leak data or bake in bias long before production.
Hook
The explorer who decides which signals the model will trust.

Word knowledge

How the word is built, where it came from, and what it sits beside in memory.

In a sentence

In a Jupyter notebook, the data scientist fits a scikit-learn logistic baseline on authentication logs, using login time and device change as the first two features.

Why these words
  • data Latin data, things given, plural of datum names the given-facts material the second word will study
  • scientist English coinage by William Whewell, from Latin scientia, knowledge, from scire, to know supplies the head noun, the knower who studies those records rather than a living species
Where it came from
Origin
English job-title collocation by DJ Patil and Jeff Hammerbacher, from Latin data (things given, plural of datum) and scientist (Whewell's 1834 coinage from Latin scientia, knowledge)
Entered the language
c. 2008
What changed
Data had meant things given, then facts granted in an argument, then the records a machine keeps. Scientist was coined in 1834 for a student of nature, modeled on artist. DJ Patil and Jeff Hammerbacher joined the pair as a job title around 2008, and the collocation became the ordinary name for the person who studies those records in a computing shop.
How it is spelled
Pattern
data stays the Latin plural of datum, even when English treats it as a mass noun
Pattern
-ist names the practitioner of a field, as in artist and chemist
Pattern
c before i is /s/ in Latin science loans, as in city and circle
Breaks the pattern
the noun phrase stays two words; a hyphen appears only when some styles treat it as a modifier
Breaks the pattern
data looks plural but computing English often treats it as a mass noun
Breaks the pattern
scientist is not sciencist; the -ce of science becomes -t- before -ist

Spelled like

  • database
  • artist
  • chemist
  • science
Broken into chunks
  • data
    • datum
    • metadata
    • database
  • sci
    • science
    • conscience
    • omniscient
  • ist
    • artist
    • chemist
    • specialist
What it sits beside

Same subject

Same shape

Data compounds

Scientist titles

  • computer scientist
  • research scientist
  • political scientist

AI job titles

Where it sits in the deck

Phase 3: Data Fundamentals: Types, Pipelines, and Preparation

Models are only as good as their data — understand the raw material and the engineering that shapes it before covering how it flows or breaks.

Neighbours in this phase