 Beta distribution (from @Statistics.Distribution.Beta@)
--
-- > λ> mwc $ listOf 10 (beta 81 219)
-- > [ 0.23238372272745833,0.252972980515086,0.22708315774257903
-- > , 0.25807200295967214,0.29794072226119983,0.24534701159196015
-- > , 0.24766870269839578,0.2994199351220346,0.2728157476212405,0.2593318159573564
-- > ]
beta :: PrimMonad m 
     => Double -- ^ shape parameter alpha
     -> Double -- ^ shape parameter beta
     -> RandT m Double
beta alpha bet = continuous $ betaDistr alpha bet

-- 
beta :: PrimMonad m 
     => Double -- ^ shape parameter alpha
     -> Double -- ^ shape parameter beta
     -> RandT m Double
beta alpha bet = continuous $ betaDistr alpha bet
beta alpha bet = continuous $ betaDistr alpha bet