i-squared distribution (from @Statistics.Distribution.ChiSquared@)
-- 
-- > λ> mwc $ listOf 10 (chiSquare 4)
-- > [ 8.068852054279787,1.861584389294606,6.3049415103095265
-- > , 1.0512164068833838,1.6243237867165086,5.284901049954076
-- > , 0.4773242487947021,1.1753876666374887,5.21554771873363
-- > , 3.477574639460651 ]
chiSquared :: PrimMonad m
           => Int -- ^ number of degrees of freedom
           -> RandT m Double
chiSquared = continuous . Chi.chiSquared

-- | F
chiSquared :: PrimMonad m
           => Int -- ^ number of degrees of freedom
           -> RandT m Double
chiSquared = continuous . Chi.chiSquared
chiSquared = continuous . Chi.chiSquared