StatReasonGet the statistical answer. Then understand it.
StatReason answers the statistics question you actually came with, whether that is a mean, a t-test, a sample size, or a confidence interval, and then helps you reason about it: what the method assumes, what the result does and does not mean, and what analysis makes sense next. Every calculation runs in your browser. Nothing you type is uploaded or stored.
Why this is different from a formula page
Answer first
The result you came for, front and center, with minimal setup. No account, no project, no method wizard unless you actually want help choosing one.
Assumption audit
Every engine separates what it can calculate from your data, what is evidence to review, and what only you can verify. A diagnostic test crossing a threshold is never treated as proof.
Plain-language interpretation
Deterministic, result-specific wording explains what happened, in which direction, by how much, and what the result does not mean, never a bare significance flag standing in for an explanation.
Browse by category
- Descriptive StatisticsSummarize a single numeric variable: center, spread, and shape.15 calculators
- Probability & DistributionsWork directly with a named probability model and its parameters.4 calculators
- Confidence Intervals & EstimationEstimate an unknown quantity with a stated margin of uncertainty.3 calculators
- Hypothesis TestsTest whether observed data provides evidence against a stated null model.6 calculators
- Correlation & AssociationMeasure how two variables move together, without claiming causation.3 calculators
- RegressionFit and interpret a model relating an outcome to one or more predictors.1 calculator
- ANOVA & Group ComparisonsCompare means across three or more groups, not just two at a time.1 calculator
- Nonparametric StatisticsCompare groups or paired data using ranks, without assuming a normal model.2 calculators
- Sample Size & Statistical PowerPlan a study design before collecting data, not just analyze it afterward.1 calculator
- Reliability & AgreementQuantify how consistent measurements, items, or raters actually are.1 calculator
- Charts & Data DiagnosticsInspect a distribution or dataset visually before or alongside a formal test.3 calculators