Anderson–Darling 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
Anderson–Darling gives additional weight to discrepancies in the tails of the fitted normal distribution.
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.