R package rootWishart. Functions for hypothesis testing in single and double Wishart settings, based on Roy’s largest root. This test statistic is especially useful in multivariate analysis. The computations are based on results by Chiani (2014) <<a href=”http://dx.doi.org/10.1016/j.jmva.2014.04.002”>doi:10.1016/j.jmva.2014.04.002</a>> and Chiani (2016) <<a href=”http://dx.doi.org/10.1016/j.jmva.2015.10.007”>doi:10.1016/j.jmva.2015.10.007</a>>. They use the fact that the CDF is related to the Pfaffian of a matrix that can be computed in a finite number of iterations. This package takes advantage of the Boost and Eigen C++ libraries to perform multi-precision linear algebra.