def F_value_multivariate(ER, EF, dfnum, dfden):
     if type(ER) in [IntType, FloatType]:
         ER = N.array([[ER]])
     if type(EF) in [IntType, FloatType]:
         EF = N.array([[EF]])
     n_um = (LA.det(ER) - LA.det(EF)) / float(dfnum)
     d_en = LA.det(EF) / float(dfden)
     return n_um / d_en


#####################################
#######  ASUPPORT FUNCTIONS  ########
#####################################
Returns an F-statistic given the following:
dataset/ETHPy150Open radlab/sparrow/src/main/python/third_party/stats.py/F_value_multivariate