Xavier Fok

correlation vs causation explained for business decisions. practical solopreneur guide with real examples, the four causation tests, and how to avoid expensive mistakes.

linear regression in Google Sheets without code or a stats degree. step-by-step tutorial with real examples, formulas, and trendlines for solopreneurs in 2026.

revenue forecasting in Excel and Google Sheets. 2026 methods including linear trends, FORECAST.ETS, scenario planning, and AI-assisted forecasts for solopreneurs.

cohort analysis tutorial for SaaS founders. retention cohorts, free tools, and step-by-step examples in Sheets, Mixpanel, and Stripe — no data team required.

customer segmentation methods for solopreneurs. 5 practical approaches (RFM, behavioral, lifecycle, value, persona) you can run in Sheets without a data team.

a/b testing for small business. complete solopreneur guide to running honest a/b tests on landing pages, emails, and pricing without a data team or budget.

time series analysis tutorial for small business. forecast revenue, spot seasonality, and detect anomalies in Sheets and Excel without any statistics background.

statistical analysis for beginners. plain-english guide to the methods solopreneurs actually use, with free tools, real examples, and zero math jargon.