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Here is my quick proof of asreg accuracy.
You can check your calculation
. sysuse auto, clear (1978 Automobile Data) . reg price mpg rep78 Source | SS df MS Number of obs = 69 -------------+---------------------------------- F(2, 66) = 11.06 Model | 144754063 2 72377031.7 Prob > F = 0.0001 Residual | 432042896 66 6546104.48 R-squared = 0.2510 -------------+---------------------------------- Adj R-squared = 0.2283 Total | 576796959 68 8482308.22 Root MSE = 2558.5 ------------------------------------------------------------------------------ price | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- mpg | -271.6425 57.77115 -4.70 0.000 -386.9864 -156.2987 rep78 | 666.9568 342.3559 1.95 0.056 -16.5789 1350.492 _cons | 9657.754 1346.54 7.17 0.000 6969.3 12346.21 ------------------------------------------------------------------------------ . asreg reg price mpg rep78, rmse variable reg not found r(111); . asreg price mpg rep78, rmse . list _rmse in 1 +-----------+ | _rmse | |-----------| 1. | 2558.5356 | +-----------+