twoway (scatter tea ifdi if country_id ==1) (lfit tea ifdi if country_id == 1)               
twoway (scatter tea ifdi if country_id ==2) (lfit tea ifdi if country_id == 2)       
twoway (scatter tea ifdi if country_id ==3) (lfit tea ifdi if country_id == 3)       
twoway (scatter tea ifdi if country_id ==4) (lfit tea ifdi if country_id == 4)
。。。
请问有没有方法直接一下子按个体将散点图画出来，上面方法比较耗时间