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exit(varname) specifies a variable coded 0/1, where at time t for firm i, varname_it equals 1 if the firm exited at the beginning of that period and
zero otherwise.
state(varlist) specifies state variables.
proxy(varname) specifies the proxy variable to be used in the equation determining exit.
free(varlist) specifies variable inputs that are not to be included in the exit equation.
cvars(varlist) specifies variable inputs that are also included in the exit equation.
仔细看了一下help文件,对这些变量终于有了一点认识
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