shapiro.test {ctest} | R Documentation

## Shapiro-Wilk Normality Test

### Description

Performs the Shapiro-Wilk test for normality.

### Usage

    shapiro.test(x)

### Arguments

`x` | a numeric vector of data values, the number of which must be between 3 and 5000. Missing values are allowed.

### Value

A list with class `"htest"` containing the following components:

`statistic` | the value of the Shapiro-Wilk statistic.
`p.value` | the p-value for the test.
`method` | the character string `"Shapiro-Wilk normality test"`.
`data.name` | a character string giving the name(s) of the data.

### References

Patrick Royston (1982) An Extension of Shapiro and Wilk's W Test for Normality to Large Samples. Applied Statistics, 31, 115–124.

Patrick Royston (1982) Algorithm AS 181: The W Test for Normality. Applied Statistics, 31, 176–180.

Patrick Royston (1995) A Remark on Algorithm AS 181: The W Test for Normality. Applied Statistics, 44, 547–551.

### See Also

`qqnorm` for producing a normal quantile-quantile plot.

### Examples

    shapiro.test(rnorm(100, mean = 5, sd = 3))
    shapiro.test(runif(100, min = 2, max = 4))

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