变量

模型1

模型2

RDI

−10.561^*** (−6.11)

16.814^*** (4.84)

RDI²

−5.806^*** (−9.02)

SIZ

34.263^*** (16.12)

36.470^*** (17.37)

Age

9.529 (1.39)

11.485^* (1.70)

LEV

−7.953^*** (−3.20)

−9.187^*** (−3.76)

SR

−6.917^*** (−3.77)

−8.931^*** (−4.92)

FIX

−20.475^*** (−4.21)

−19.732^*** (−4.14)

常数项

−240.720^*** (−11.26)

−248.053^*** (−11.82)

R-sq

0.289

0.316

F值

82.72

85.58