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想借楼问一下,在xttobit回归中加入vce(bootstrap)后,wald检验结果无法显示了??
Bootstrap replications (5)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
.....
Random-effects tobit regression Number of obs = 3,217
Group variable: id Number of groups = 715
Random effects u_i ~ Gaussian Obs per group:
min = 1
avg = 4.5
max = 7
Integration method: mvaghermite Integration pts. = 12
Wald chi2(4) = .
Log likelihood = 1517.1209 Prob > chi2 = .
(Replications based on 615 clusters in id)
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