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Correlation Analyzer Field Guide: When Three Correlation Methods on One CSV Return Three Different Stories
Correlation analysis looks simple on the surface: paste a CSV, get a coefficient between -1…
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Regression Lives in the Browser Now
A regression line is the simplest summary a dataset can give you. Run a straight…
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Regression Analyzer Field Guide: When Six Inputs, Three Diagnostic Bands, and One Outlier Toggle Decide Whether Your Fit Lands at R² = 0.92 or Silently Drifts to 0.41
Most regression tools print a slope and an intercept and stop. The Regression Analyzer does…
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Coefficient of Variation Calculator Field Guide: When Standard Deviation Lies About Variability and Three CSV Columns Quietly Disagree on Spread
Strong close-first lead. Standard deviation sounds like the most rigorous spread metric you can compute,…
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Contingency Table Chi-Square Fisher Exact Cramér V Tutor Field Guide: When Seven Decisions Decide Whether Your 2×2 Chi-Square Lands as a Defensible Statistic or a Story You Tell Yourself
Five tests, one tutor, and a table that decides whether your chi-square is even legal. Walk the seven decisions, three traps, and four audit checks.
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Two Proportion Z Test Calculator Field Guide: When Five Counts In and Three Numbers Out Decide Whether Your A/B Test Won
Two proportions, one verdict. Most A/B tests end in a tie-breaker — the variant with…
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Regression Analyzer Field Guide: When Twelve Diagnostics Decide Whether Your Regression Survives a New Data Point
R² is a sales prop. Confidence and prediction bands, residual patterns, leverage and Cook's distance, and adjusted R² are what tell you whether your regression is ready to publish — or whether to drop three leverage points first.
A/B Test Significance Calculator Field Guide: When the p-value Tells Half the Story
The p-value is the headline number, but it is the headline number that misleads most…
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A/B Test Significance Calculator Field Guide 2026-08-12
Stop ending experiment reviews with "p ~= 0.06, ship it" or "5,000 visitors, looks promising"…
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ANOVA Calculator Field Guide: One-Way ANOVA Without the Spreadsheet
Run one-way ANOVA on multiple labeled groups, inspect sums of squares, F statistic, and p-value, and audit the per-group summary before you trust the headline number.