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Found 126 Skills
Statistical analysis: t-tests, chi-squared, Mann-Whitney, p-values, CIs, Bonferroni/BH, Bayesian A/B
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Systematically validate your business hypotheses before building anything. Master Steve Blank's Customer Development methodology that became the foundation of Lean Startup and YC's approach. Use when: **Starting a new venture** to avoid building something nobody wants; **Before writing a line of code** to validate problem-solution fit; **Pivoting decisions** to systematically test new directions; **Early-stage fundraising** to prove market validation; **Product roadmap planning** to prioritiz...
Use when investigating why something happened and need to distinguish correlation from causation, identify root causes vs symptoms, test competing hypotheses, control for confounding variables, or design experiments to validate causal claims. Invoke when debugging systems, analyzing failures, researching health outcomes, evaluating policy impacts, or when user mentions root cause, causal chain, confounding, spurious correlation, or asks "why did this really happen?"
Generate structured research questions, testable hypotheses, and empirical strategies from a topic or dataset
Four-phase debugging framework - root cause investigation, pattern analysis, hypothesis testing, implementation. Ensures understanding before attempting fixes.