在处理工业企业数据库时,遇到这样的问题,代码如下:
forvalues i = 1998/2007{
disp "File `i'"
use `"D:\360Downloads\stata15\`i'.dta"',clear
gen id_in_source = _n
keep id_in_source a_dep admin_expense bdat uniqueid id name legal_person town prov ///
c_dep cost current_asset e_collective phone zip product1 bdat industry_code dq revenue ///
e_foreign e_HMT e_individual e_legal_person e_state export employment profit///
fa_net fa_original fa_total fin_expense input interest inventory ls neighborhood///
new_producet output owners_equity paidup_captital prefecture product2 product3///
sales_expense scale street subsidy tax tax_add total_asset total_debt type///
va village wage
saveold m`i'.dta,replace
}