- One Row, One Person
When one person lives across two rows, your analysis lies. One row per person, outcome in one column, group in another, rinse and repeat. That simple rule turns tangled sheets into answers you can trust.
- Name It So Future-You Smiles
“var0001” is how mistakes breed. “score,” “group,” “time_ms” is how clarity spreads. Label for the human who reads it next… likely you.
- Define Groups Exactly (Copy/Paste the Label)
“Control” ≠ “control.” One stray letter and your software can’t find your group. Copy/paste the label text to eliminate typos at the source.
- Decide the Tail Before the Tale
If “better” is the claim, say “greater” before you run anything. Lock the direction, lock the integrity. Numbers follow, not lead.
- Close Yesterday’s Output
Old results hide under new ones. Close prior runs so you don’t quote last week’s stats in today’s decision. Clean workspace, clean mind.
- Use Two Groups When Experience Lingers
If doing A changes how people do B, don’t reuse people. Split into two groups. You want a test of A vs B… not A-then-B.
- Speak the Difference in Plain English
Confidence intervals on the difference translate to plans: “Version A likely beats B by 0.5–4.5 points.” Now budget, staffing, or launch timing has a number.
- Numbers → Next Step
A result without a move is trivia. End every analysis with a decision: keep, change, double-down, or stop. Insight earns its keep when it changes behavior.
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