想问下如何在不删除bfc=1的情况下,将bfc=0所对应的样本数据中的k17=1的数据筛选出来,同时bfc=1的数据仍旧存在。
Example generated by -dataex-. To install: ssc install dataex
clear
input str7 id str35 stra_sector byte k17 float bfc
"3" "15 Food" 1 0
"5" "15 Food" 1 0
"6" "15 Food" 7 0
"8" "15 Food" 1 0
"12" "15 Food" 1 0
"14" "15 Food" 2 0
"16" "15 Food" 1 0
"18" "15 Food" 2 0
"19" "38 Other Manufacturing" 1 0
"20" "15 Food" 2 0
"21" "15 Food" 4 0
"22" "15 Food" 2 0
"24" "15 Food" 6 0
"25" "15 Food" 4 0
"28" "15 Food" 1 0
"29" "15 Food" 1 0
"30" "15 Food" . 1
"31" "15 Food" 1 0
"32" "15 Food" 1 0
"33" "15 Food" 1 0