用王群勇老师方法做门槛模型时,门槛值的置信区间没有显示出来,但显著性水平通过检验,这是怎么回事?另外LR图门槛值也没有落在置信区间中,求高人解答。具体程序结果如下:
. xthreg thc cit cit2 thi inv edu ope old, rx(sec) qx(cit) thnum(2) trim(0.01 0.05) bs(300 300)
Estimating the threshold parameters: 1st ...... 2nd ...... Done
Boostrap for single threshold
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Boostrap for double threshold model:
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Threshold estimator (level = 95):
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model | Threshold Lower Upper
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Th-1 | 0.1404 . .
Th-21 | 0.1404 . .
Th-22 | 0.7384 0.7224 0.7525
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Threshold effect test (bootstrap = 300300):
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Threshold | RSS MSE Fstat Prob Crit10 Crit5 Crit1
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Single | 2.5296 0.0044 280.14 0.0000 48.9440 77.4491 128.8443
Double | 2.5022 0.0044 6.22 0.7667 32.1273 47.2449 76.7683
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