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换了initial 之后,还是运行有错
. xtlsdvc il lnec et cover ed t, initial(ah) bias(3) vcov(50)
note: variable cover is time-invariant over the
estimation sample and has been discarded
Bias correction initialized by Anderson and Hsiao estimator
note: Bias correction up to order O(1/NT^2)
no observations
command -> xtlsdvc_b il lnec et ed t , initial(ah) bi(3)
an error occurred when command was executed on original dataset
please rerun and specify the trace option to see a trace of the commands executed
r(2000);
Search of official help files, FAQs, Examples, SJs, and STBs
[P] error . . . . . . . . . . . . . . . . . . . . . . . . Return code 2000
no observations;
You have requested some statistical calculation and there are
no observations on which to perform it. Perhaps you specified
if or in and inadvertently filtered all the data.
(end of search)
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