Supplementary data【数据+Stata】 示例代码 xtset id_code year xtreg ly $xvar, re predict e_errors, e g onee=1 *** TRUNCATED-NORMAL *** *** variables labelled zm_* are log mean corrected values of exogenous variables sfcross e_errors onee , noconstant d(t) emean(zm_numberofcustomer ...