STATA:取得字符串的第n个单词,也可处理中文,以空格为分界符
//word函数是以空格为界 //word(s,n) 取得字符串s的第n个单词 // make a1 a2 //make:AMC Concord Concord AMC order a1 a2,after(make) //返回变量make的第2个单词 gen a3=word(make,2) //返回变量make的第1个单词 gen a2=word(make,1) //a1:中 国 control a4:国 a5:中 gen a4=word(a1,2) gen a5=word(a1,1)