---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
number | -.1390026 -.1164673 -.0225353 .0160631
number2 | .0058749 .0046971 .0011778 .0008414
same | -.0152933 .0370423 -.0523355 .033273
percent1 | -1.501151 -1.778934 .2777831 .0311858
percent2 | -.3234957 -.170037 -.1534587 .0381601
au | -.2372394 -.1766614 -.060578 .0248776
let | -.7757885 -.4548138 -.3209747 .0851589
debt | .0052182 .0048186 .0003996 .0016769
------------------------------------------------------------------------------
b = consistent under Ho and Ha; obtained from xtreg
B = inconsistent under Ha, efficient under Ho; obtained from xtreg
Test: Ho: difference in coefficients not systematic
chi2(8) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 71.42
Prob>chi2 = 0.0000
(V_b-V_B is not positive definite)
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
number | 3.353571 2.581077 .7724946 .4781767
number2 | -.1503857 -.117099 -.0332867 .023831
same | 4.517556 3.115545 1.40201 .7054645
percent1 | 5.141897 5.294296 -.1523985 .9315564
percent2 | -.6342704 .3974377 -1.031708 1.07433
au | -1.245189 -1.049353 -.1958365 .549039
let | -1.533172 -.495005 -1.038167 1.450047
debt | -.0219574 -.0601344 .038177 .0306282
------------------------------------------------------------------------------
b = consistent under Ho and Ha; obtained from xtreg
B = inconsistent under Ha, efficient under Ho; obtained from xtreg
Test: Ho: difference in coefficients not systematic
chi2(8) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 13.26
Prob>chi2 = 0.1031
1.请教是不是第一个检验结果是用固定效应模型,第二个用随机效应?
2.Test: Ho: difference in coefficients not systematic 这句话表明什么意思呢?
3.为什么第一个检验最后显示 (V_b-V_B is not positive definite) 它有什么含意呢?
小弟对理论理解地不够深,只是最近下载了些教程,照着做了一些,还请大家赐教。


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