黃河泉 发表于 2017-9-5 17:12
尔后建議用 dataex (先 ssc install dataex 并见说明) 将原始 Stata 资料中具有”代表性”的一部分资料列出 ...
请教您一个问题,打扰啦,如何保留每一年度每一行业前百分之三十的age的数据,以及每一年度每一行业后百分之三十的数据
stkcd year industry birth age
1 2016 J 1991 25
1 2018 J 1991 27
1 2017 J 1991 26
1 2015 J 1991 24
1 2019 J 1991 28
1 2020 J 1991 29
2 2020 K 1991 29
2 2015 K 1991 24
2 2017 K 1991 26
2 2018 K 1991 27
2 2019 K 1991 28
2 2016 K 1991 25
4 2016 C27 1991 25
4 2018 C27 1991 27
4 2019 C27 1991 28
4 2020 I 1991 29
4 2015 C27 1991 24
4 2017 C27 1991 26
5 2016 N 1990 26
5 2017 N 1990 27
5 2020 N 1990 30
5 2015 K 1990 25
5 2019 N 1990 29
5 2018 N 1990 28
6 2019 K 1992 27
6 2016 K 1992 24
6 2020 K 1992 28
6 2017 K 1992 25
6 2015 K 1992 23
6 2018 K 1992 26
7 2017 K 1992 25
7 2020 K 1992 28
7 2018 K 1992 26
7 2016 H 1992 24
7 2019 K 1992 27
7 2015 H 1992 23
8 2018 C37 1992 26
8 2017 C37 1992 25
8 2015 C37 1992 23
8 2016 C37 1992 24
8 2020 C37 1992 28
8 2019 C37 1992 27
9 2019 S 1991 28
9 2016 S 1991 25
9 2015 S 1991 24
9 2017 S 1991 26
9 2018 S 1991 27
9 2020 S 1991 29
10 2015 E 1995 20
10 2020 E 1995 25
10 2016 E 1995 21
10 2017 E 1995 22
10 2019 E 1995 24
10 2018 E 1995 23
11 2015 K 1992 23
11 2018 K 1992 26
11 2016 K 1992 24
11 2019 K 1992 27
11 2017 K 1992 25
11 2020 K 1992 28
12 2020 C30 1992 28
12 2018 C30 1992 26
12 2017 C30 1992 25
12 2019 C30 1992 27
12 2016 C30 1992 24
12 2015 C30 1992 23
14 2015 K 1992 23
14 2019 K 1992 27
14 2020 K 1992 28
14 2016 K 1992 24
14 2018 K 1992 26
14 2017 K 1992 25
16 2015 C39 1992 23
16 2020 C39 1992 28
16 2016 C39 1992 24
16 2019 C39 1992 27
16 2017 C39 1992 25
16 2018 C39 1992 26
17 2016 C37 1992 24
17 2020 C37 1992 28
17 2019 C37 1992 27
17 2017 C37 1992 25
17 2018 C37 1992 26
17 2015 C37 1992 23
18 2018 E 1992 26
18 2015 C17 1992 23
18 2017 E 1992 25
18 2016 E 1992 24
18 2019 E 1992 27
19 2018 C15 1992 26
19 2019 F 1992 27
19 2016 C15 1992 24
19 2017 C15 1992 25
19 2020 F 1992 28
19 2015 C15 1992 23
20 2020 C39 1992 28
20 2017 C39 1992 25
20 2016 C39 1992 24
20 2015 C39 1992 23
20 2018 C39 1992 26
20 2019 C39 1992 27
21 2016 C39 1994 22
21 2017 C39 1994 23
21 2015 C39 1994 21
21 2020 C39 1994 26
21 2018 C39 1994 24
21 2019 C39 1994 25
22 2017 G 1993 24
22 2015 G 1993 22
22 2018 G 1993 25
22 2016 G 1993 23
23 2020 C30 1993 27
23 2019 C30 1993 26
23 2016 C30 1993 23
23 2018 C30 1993 25
23 2017 C30 1993 24
23 2015 C30 1993 22
24 2015 K 1993 22
25 2016 F 1993 23
25 2018 F 1993 25
25 2015 F 1993 22
25 2017 F 1993 24
25 2019 F 1993 26
25 2020 F 1993 27
26 2020 F 1993 27
26 2019 F 1993 26
26 2016 F 1993 23
26 2015 F 1993 22
26 2018 F 1993 25
26 2017 F 1993 24
27 2019 D 1993 26
27 2016 D 1993 23
27 2020 D 1993 27
27 2015 D 1993 22
27 2018 D 1993 25
27 2017 D 1993 24
28 2017 F 1993 24
28 2019 F 1993 26
28 2018 F 1993 25
28 2015 F 1993 22
28 2020 F 1993 27
28 2016 F 1993 23
29 2015 K 1993 22
29 2019 K 1993 26
29 2018 K 1993 25
29 2016 K 1993 23
29 2017 K 1993 24
29 2020 K 1993 27
30 2020 C36 1993 27