reg tax

F(2, 27) = 1924.56 R-squared = 0.9930

gdp gnp

Prob > F = 0.0000 Adj R-squared = 0.9925

tax

Coef.

Std. Err.

t

P > t

95% CI下限

95% CI上限

gdp

0.2609296

0.6320747

0.41

0.683

−1.035981

1.55784

gnp

−0.0832956

0.6337976

−0.13

0.896

−1.383741

1.21715

_cons

−2929.219

1247.333

−2.35

0.026

−5488.536

−369.9028