# signrank

Wilcoxon signed rank test

## Syntax

## Description

returns
the `p`

= signrank(`x`

)*p*-value of a two-sided Wilcoxon signed rank test.

`signrank`

tests the null hypothesis that data
in the vector `x`

come from a distribution whose
median is zero at the 5% significance level. The test assumes that
the data in `x`

come from a continuous distribution
symmetric about its median.

returns
the `p`

= signrank(`x`

,`y`

,`Name,Value`

)*p*-value for the sign test with additional options
specified by one or more `Name`

,`Value`

pair
arguments.

`[___] = signrank(`

returns
any of the output arguments in the previous syntaxes for the signed
rank test with additional options specified by one or more `x`

,`m`

,`Name,Value`

)`Name`

,`Value`

pair
arguments.

## Examples

## Input Arguments

## Output Arguments

## More About

## Algorithms

`signrank`

treats `NaN`

s in `x`

and `y`

as
missing values and ignores them.

For the two-sample case, `signrank`

uses a tolerance based on the values
`epsdiff = eps(x) + eps(y)`

. `signrank`

computes the
absolute values of the differences (`abs(d(i))`

where ```
d(i) = x(i) –
y(i)
```

) and compares them to `epsdiff`

. Values with an absolute
value less than `epsdiff`

(`abs(d(i)) < epsdiff(i)`

) are
treated as ties.

## References

[1] Gibbons, J. D., and S. Chakraborti. *Nonparametric
Statistical Inference*, 5th Ed., Boca Raton, FL: Chapman
& Hall/CRC Press, Taylor & Francis Group, 2011.

[2] Hollander, M., and D. A. Wolfe. *Nonparametric
Statistical Methods*. Hoboken, NJ: John Wiley & Sons,
Inc., 1999.

## Version History

**Introduced before R2006a**