def stderr(a, axis=0, ddof=1):
 (a, axis) = _chk_asarray(a, axis)
 return (std(a, axis, ddof=1) / float(sqrt(a.shape[axis])))

def stderr ( a , axis = 0 , ddof = 1 ) : ( a , axis ) = _chk_asarray ( a , axis ) return ( std ( a , axis , ddof = 1 ) / float ( sqrt ( a . shape [ axis ] ) ) )
returns the estimated population standard error of the values in the passed array .