Introduction
Everything you need to connect a source, build your first cube, and ask a question that returns a ranked answer.
What WHYSE does
WHYSE turns a plain-English question about a metric into a ranked list of the segments that explain it. You don't write the query and you don't pick the segments — the engine walks the cube and orders the results by how much each one accounts for.
The cube
Before you can ask anything, WHYSE pre-aggregates your source into a cube: every combination of the dimensions you choose, summarised once. After that, a segment's statistics are a lookup rather than a scan, which is why the answer arrives in seconds and why the cost doesn't grow with the number of questions.
The columns you slice by
The numbers you're explaining
The finest level the cube can answer at
How often new data is merged in
Ask your first question
whyse ask "why did revenue drop last quarter?"--source orders--measure revenue--window 2026-Q2 vs 2026-Q1
Before you rely on a result
Read Method → Multiple comparisons and Method → Limits first. They cover what the ranking does and does not prove, and they'll save you defending a result you didn't need to defend.
Next
Connect a source to build your first cube, or read Analysis for what each question type returns.