门槛回归求助 用xthreg2出现了 r3301,这是怎么回事啊
命令是:
xi:xthreg2 RDrate $control i.Year, rx(x1) qx(market) thnum(1) trim(0.1) bs(300 ) grid(150) r
报错:
i.Year _IYear_2009-2022 (naturally coded; _IYear_2009 omitted)
There exist time-invariant individual(s) (maybe only one obs): RDrate Qrate_w size_w Opg_w Lev_w hefin_w _IYear_201
> 0 _IYear_2011 _IYear_2012 _IYear_2013 _IYear_2014 _IYear_2015 _IYear_2016 _IYear_2017 _IYear_2018 _IYear_2019 _IYe
> ar_2020 _IYear_2021 _IYear_2022 x1 market
xtdev2(): 3301 subscript invalid
thestm2(): - function returned error
<istmt>: - function returned error
r(3301);


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