testnl (_b[lnox] * _b[stratio] = 0.06) (_b[rooms] / _b[ldist]=3*_b[lnox])
(1) _b[lnox] * _b[stratio] = 0.06
(2) _b[rooms] / _b[ldist] = 3*_b[lnox]
F(2, 501) = 5.13
Prob > F = 0.0062
nlcom (_b[lnox] * _b[stratio] -0.06) (_b[rooms] / _b[ldist]-3*_b[lnox])
_nl_1: _b[lnox] * _b[stratio] -0.06
_nl_2: _b[rooms] / _b[ldist]-3*_b[lnox]
---------------------------------------------------------------------------
> ---
lprice | Coef. Std. Err. t P>|t| [95% Conf. Interv
> al]
-------------+-------------------------------------------------------------
> ---
_nl_1 | -.0099857 .0083193 -1.20 0.231 -.0263307 .0063
> 594
_nl_2 | .9659737 .9455486 1.02 0.307 -.8917555 2.823
> 703
---------------------------------------------------------------------------
> ---
为什么testnl是联合检验的结果 而 nlcom 的结果是两个呢 ???求解答 谢谢


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