def smoment(X, n, condition=None, **kwargs):
 sigma = std(X, condition, **kwargs)
 return (((1 / sigma) ** n) * cmoment(X, n, condition, **kwargs))

def smoment ( X , n , condition = None , ** kwargs ) : sigma = std ( X , condition , ** kwargs ) return ( ( ( 1 / sigma ) ** n ) * cmoment ( X , n , condition , ** kwargs ) )
return the nth standardized moment of a random expression i .