|
黄老师您好,我有个问题想请教一下,我用xthreg加vce(robust)命令,变量结果都挺好,但是结果中的f检验显示是·(空白?)如图一所示。然后我又试了一下把vce(robust)选项删去,f检验结果就有了,变量结果也挺好,如图2所示。想请问一下老师,这是怎么回事啊?我应该怎么调整来使得加vce(robust)选项的情况下,f检验能正常出现呢(因为我论文结果里需要列出f检验的结果)。期待您的回复,谢谢!
图1:
xthreg y3 is m infr fd gov,rx(mot) qx(rd) thnum(1) grid(400) trim( 0.02 ) bs(300) vce(robust)
Estimating the threshold parameters: 1st ...... Done
Boostrap for single threshold
.................................................. + 50
.................................................. + 100
.................................................. + 150
.................................................. + 200
.................................................. + 250
.................................................. + 300
Threshold estimator (level = 95):
-----------------------------------------------------
model | Threshold Lower Upper
-----------+-----------------------------------------
Th-1 | 0.2100 0.2000 0.2200
-----------------------------------------------------
Threshold effect test (bootstrap = 300):
-------------------------------------------------------------------------------
Threshold | RSS MSE Fstat Prob Crit10 Crit5 Crit1
-----------+-------------------------------------------------------------------
Single | 0.0661 0.0004 49.16 0.0000 20.7404 23.2570 29.3277
-------------------------------------------------------------------------------
Fixed-effects (within) regression Number of obs = 195
Group variable: i Number of groups = 13
R-sq: within = 0.8967 Obs per group: min = 15
between = 0.0026 avg = 15.0
overall = 0.1409 max = 15
F(6,12) = .
corr(u_i, Xb) = -0.0308 Prob > F = .
(Std. Err. adjusted for 13 clusters in i)
图2:
xthreg y3 is m infr fd gov,rx(mot) qx(rd) thnum(1) grid(400) trim( 0.02 ) bs(300)
Estimating the threshold parameters: 1st ...... Done
Boostrap for single threshold
.................................................. + 50
.................................................. + 100
.................................................. + 150
.................................................. + 200
.................................................. + 250
.................................................. + 300
Threshold estimator (level = 95):
-----------------------------------------------------
model | Threshold Lower Upper
-----------+-----------------------------------------
Th-1 | 0.2100 0.2000 0.2200
-----------------------------------------------------
Threshold effect test (bootstrap = 300):
-------------------------------------------------------------------------------
Threshold | RSS MSE Fstat Prob Crit10 Crit5 Crit1
-----------+-------------------------------------------------------------------
Single | 0.0661 0.0004 49.16 0.0000 20.7404 23.2570 29.3277
-------------------------------------------------------------------------------
Fixed-effects (within) regression Number of obs = 195
Group variable: i Number of groups = 13
R-sq: within = 0.8967 Obs per group: min = 15
between = 0.0026 avg = 15.0
overall = 0.1409 max = 15
F(7,175) = 217.10
corr(u_i, Xb) = -0.0308 Prob > F = 0.0000
|