Data Analysis Quality

This skill establishes whether an analysis can support its stated claim. It owns the quality and traceability gate around an analysis; it does not own query syntax, chart design, statistical inference, data cleaning, or independent review.

Define the claim before trusting the number

Write an analysis definition that a second analyst could implement:

decision/question:
metric and numerator/denominator:
unit of analysis (grain):
population and deliberate exclusions:
time window, timezone, and comparison baseline:
source tables/files and refresh/cut-off time:
known assumptions and expected failure modes: