没有问题啊不是命令的事情，
. use auto
(1978 Automobile Data)
. gen r2=.
(74 missing values generated)
. reg price rep78
Source | SS df MS Number of obs = 69
-------------+------------------------------ F( 1, 67) = 0.00
Model | 24770.7652 1 24770.7652 Prob > F = 0.9574
Residual | 576772188 67 8608540.12 R-squared = 0.0000
-------------+------------------------------ Adj R-squared = -0.0149
Total | 576796959 68 8482308.22 Root MSE = 2934
------------------------------------------------------------------------------
price | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
rep78 | 19.28012 359.4221 0.05 0.957 -698.1295 736.6897
_cons | 6080.379 1274.06 4.77 0.000 3537.345 8623.413
------------------------------------------------------------------------------
. replace r2 = e(r2)
(74 real changes made)
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