def METHOD_NAME(self):
    for varName in self.ps.dtype.names:
        yv = self.res['fitResults'][varName]
        if hasattr(self, varName):
            yv += self.__getattribute__(varName)
        me = ((self.ps[varName].ravel() - yv)**2).mean()
        print(('%s: %3.2f' % (varName, me)))