Shapiro–Wilk normality calculator
Paste one sample and compare the statistic, p-value and QQ plot.
Normal QQ plot
Inspect departures from the line.
Ordered quantiles
| Order | Theoretical | Observed |
|---|---|---|
| Fill in the fields above — the result is computed on this page. | ||
How to use this page
- Paste values.
- Inspect the statistic and plot.
What this page does not do: The p-value is an approximation and does not validate independence or the sampling plan.
Further reading
The calculation uses expected normal scores and a documented large-sample approximation to the Shapiro–Wilk family.
Frequently asked questions
What does a small p-value mean?
The sample is difficult to reconcile with a fitted normal distribution.
See also
A/B test calculator
Compare two proportions in an A/B test. Calculate conversion rates, difference, uplift, z score, p value and c
A/B test planning — sample size, MDE and duration
Plan a two-proportion experiment, estimate detectable effect and traffic duration.
ACF and PACF autocorrelation calculator
Calculate ACF and PACF across time-series lags. Review the chart, reference bounds and coefficient table.