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st: Why is some observations lost when specifying bw(1) in xtivreg2
I have a sample of 910 observations, 91 groups and 10 years, without any
missing data. When I estimate a robust fixed effect model the Number of obs
is correctly reported as 910, but when I also specify bw(1) the Number of
obs is reported to be 842. Can someone help me with an explanation to this?
Thank you in advance for your help!
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