Normality Testing
statisticsShapiro-Wilk, Lilliefors and Anderson-Darling tests, with a plain English conclusion.
Data
One result per line. Columns can be separated by spaces, commas, semicolons or tabs, so you can paste straight from Excel.
| Column | What it is | Example |
|---|---|---|
| 1. Result | The measured value | 12.4 |
A line looks like 12.4
For a result below the laboratory limit of reporting, enter it as <LOR, e.g. <0.5.
Drop a CSV or Excel file here, or
Read in your browser and put in the box below. The file itself is not uploaded.
10 value(s) parsed
Options
Paste your data and run the analysis
Test results and a Q-Q plot will appear here.
What this calculates
Goodness of fit testing against normal and lognormal distributions using the Shapiro-Wilk test (Royston approximation), the Lilliefors test and the Anderson-Darling test, with a plain English conclusion about which distribution fits your data.
Method references
Shapiro and Wilk (1965), Royston (1992), Lilliefors (1967), Stephens (1974), D'Agostino and Stephens (1986) Goodness of Fit Techniques.