-----------------------------------------------------------------------
y | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
x| -.1491291 .0732517 -2.04 0.042 -.2931585 -.0050997
x2 | .0710532 .0359182 1.98 0.049 .0004299 .1416765
Xfdi | .9153376 .2864474 3.20 0.002 .3521172 1.478558
X2fdi | 2.448103 .6630424 3.69 0.000 1.144412 3.751795
fdi | .3549712 .1011435 3.51 0.001 .1561002 .5538423
gov | -.0817635 .0300454 -2.72 0.007 -.1408395 -.0226875
urb | .4387334 .0472376 9.29 0.000 .3458537 .5316131
n | .0000551 .0000133 4.15 0.000 .000029 .0000812
sai | .0050887 .0037101 1.37 0.171 -.0022062 .0123835
lnind | -.0136156 .0044408 -3.07 0.002 -.0223473 -.004884
_cons | .0787783 .0471809 1.67 0.096 -.01399 .1715466
-------------+----------------------------------------------------------------
加入调节变量fdi后,交互项都是正的,这样是否能证明存在U型调节关系


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