回归分析加不加常数项_关于回归模型中是否需要加入截距项的问题

作者：酷酷是懒虫 | 2024-07-15 14:52:07

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为什么不需要加截距项

. sysuse auto

(1978 Automobile Data)

r; t=0.00 22:53:28

. reg price weight turn

Source | SS df MS Number of obs = 74

-------------+---------------------------------- F(2, 71) = 21.54

Model | 239799649 2 119899825 Prob > F = 0.0000

Residual | 395265747 71 5567123.19 R-squared = 0.3776

-------------+---------------------------------- Adj R-squared = 0.3601

Total | 635065396 73 8699525.97 Root MSE = 2359.5

------------------------------------------------------------------------------

price | Coef. Std. Err. t P>|t| [95% Conf. Interval]

-------------+----------------------------------------------------------------

weight | 3.914597 .6905142 5.67

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