Nothing
This package gives you the exact first four permutation moments for the most commonly used quadratic form statistics, which need not be positive definite. The extension of this work to quadratic forms greatly expands the utility of density approximations for these problems, including for highdimensional applications, where the statistics must be extreme in order to exceed stringent testing thresholds. Approximate pvalues are obtained by matching the exact moments to the Pearson family of distributions using the PearsonDS package.
Package details 


Author  YiHui Zhou 
Maintainer  YiHui Zhou <yihui_zhou@ncsu.edu> 
License  GPL (>= 2) 
Version  1.0 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.