用esttab在做环境库茨涅兹曲线时报错，<br>
local m "fe"
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. esttab `m' using 环境库茨涅兹曲线.rtf ,
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(output written to 环境库茨涅兹曲线.rtf)
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. replace star(* 0.1 ** 0.05 *** 0.01) b(%14.2f) t(%14.2f) compress nogap
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factor-variable and time-series operators not allowed<br>
求大佬解答