Statistics Calculators (19)

This statistics calculator collection covers the real math behind data analysis, starting with a standard deviation calculator for measuring how spread out a dataset really is, and a probability calculator for working out the real odds of an event. From there, work out a z score, a sample size for a study before you run it, a confidence interval around your results, and a p value for testing statistical significance.

There is also real coverage for the deeper statistical toolkit: t test and chi square test for comparing groups, linear regression for finding a real trend line, correlation coefficient for measuring how two variables move together, and normal, Poisson, and binomial distributions for modeling real world data. Round it out with mean and median, margin of error, Cohen's d for effect size, moving average for smoothing a data series, forecast accuracy for checking a model's real predictions, and A/B test significance for a real product decision.