在用rdrobust和rdbwselect指令时,stata均报出如下错误,不知道是哪里出了问题呀,请求各位大佬解答。数据是用的CFPS四年的数据,一共有10000多个观测值。
指令:rdrobust rlfzc age,c(60.5) fuzzy(NRSP) bwselect(msesum) vce(cluster fid)
结果:rdrobust() not able to compute the loc. poly. bandwidth (h) above the threshold. Please run rdbwselect() for more information}
r(125);
指令:rdbwselect rlfzc age,c(60.5) all
结果:Invertibility problem in the computation of preliminary bandwidth below the thresholdInvertibility problem in the computation of preliminary bandwidth above the thresholdInvertibility problem in the computation of bias bandwidth (b) below the thresholdInvertibility problem in the computation of bias bandwidth (b) above the thresholdInvertibility problem in the computation of loc. poly. bandwidth (h) below the thresholdInvertibility problem in the computation of loc. poly. bandwidth (h) above the threshold
Bandwidth estimators for sharp RD local polynomial regression.
Cutoff c = 60.5 | Left of c Right of c Number of obs = 10458
-------------------+---------------------- Kernel = Triangular
Number of obs | 5983 4475 VCE method = NN
Min of age | 50.000 61.000
Max of age | 60.000 70.000
Order est. (p) | 1 1
Order bias (q) | 2 2
Outcome: rlfzc. Running variable: age.
--------------------------------------------------------------------------------
| BW est. (h) | BW bias (b)
Method | Left of c Right of c | Left of c Right of c
-------------------+------------------------------+-----------------------------
mserd | . . | . .
msetwo | . . | . .
msesum | . . | . .
msecomb1 | . . | . .
msecomb2 | . . | . .
-------------------+------------------------------+-----------------------------
cerrd | . . | . .
certwo | . . | . .
cersum | . . | . .
cercomb1 | . . | . .
cercomb2 | . . | . .
--------------------------------------------------------------------------------


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