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opreg depvar [if] [in], exit(varname) state(varlist) proxy(varname) free(varlist) [options]
exit(varname) varname indicates a firm's exit
* state(varlist) state variables appearing in production function
* proxy(varname) variable to proxy for unobserved productivity
* free(varlist) additional variables used in the second stage only
cvars(varlist) additional variables used in both the first and second stages
second use second-degree polynomial expansion
vce(bootstrap, bootstrap_options) specify bootstrap options
level(#) set confidence level; default is level(95)
上述命令中的exit(varname) state(varlist) proxy(varname) free(varlist) 具体表达什么意思,请高人指点。
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