让巧妇有米可炊 (提問時，如何附上適當的資料)

棒！给大神点赞

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input int year long hhid byte gen int age
   
4. 2015  201101160 1 1944
   
5. 2015 2013004118 1 1972
   
6. 2015 2015022395 1 1935
   
7. 2015 2015037238 1 1961
   
8. 2015 2015024908 1 1962
   
9. 2015 2015010660 1 1950
   
10. 2015 2013024910 1 1963
    
11. 2015  201104726 1 1965
    
12. 2015 2015037213 1 1973
    
13. 2015 2015037204 2 1964
    
14. end

复制代码

请教老师，如何分类统计既有出口又有进口的企业呀？代码如下：

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str10 id str20 type
   
4. "1" "进口"
   
5. "1" "出口"
   
6. "2" "进口"
   
7. "2" "进口"
   
8. "3" "进口"
   
9. "3" "出口"
   
10. "4" "出口"
    
11. end

复制代码

sflyhappy 发表于 2021-6-25 16:14
请教老师，如何分类统计既有出口又有进口的企业呀？代码如下：

请先 ssc install egenmore，并试试

1. bys id: egen d = nvals(type)
   
2. keep if d == 2

复制代码

黃河泉 发表于 2017-1-5 17:27
让巧妇也有米炊！
俗语说的好：巧妇难为无米之炊。论坛上许多人在问问题时会附上一部分资料甚至所要之结果 ...

1. <br>
2. * Example generated by -dataex-. To install: ssc install dataex<br>
3. clear<br>
4. input float lnsgdp<br>
5. 14.709036<br>
6. 14.850536<br>
7. 14.969208<br>
8. 15.080749<br>
9. 15.21528<br>
10. 15.293166<br>
11. 15.346704<br>
12. 15.449254<br>
13. 15.54457<br>
14. 15.632578<br>
15. end<br>

复制代码

<br>
如何计算5年滚动标准差啊？

冬天的窝窝头 发表于 2021-7-11 17:24
如何计算5年滚动标准差啊？

1.  资料请多一点，2. 请根据你的资料说明要计算什么？

----------------------- copy starting from the next line -----------------------

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str12 Typrep
   
4. "A"
   
5. "B"
   
6. "B"
   
7. "A"
   
8. "A"
   
9. "B"
   
10. "A"
    
11. "B"
    
12. "A"
    
13. "B"
    
14. end

复制代码

------------------ copy up to and including the previous line ------------------

1. * Example generated by -dataex-. For more info, type help dataex
   
2. clear
   
3. input str4 x double(a b)
   
4. "A"  1 1
   
5. "B"  2 1
   
6. "C" 34 1
   
7. "D" 35 2
   
8. "E"  4 2
   
9. "F" 34 2
   
10. "G"  6 2
    
11. end

复制代码

----------------------- copy starting from the next line -----------------------

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input float(a b c)
   
4. 1 1 1
   
5. 0 1 1
   
6. 0 1 0
   
7. 0 1 0
   
8. 1 1 0
   
9. 1 1 0
   
10. 0 0 0
    
11. end

复制代码

------------------ copy up to and including the previous line ------------------

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input float(a b c)
   
4. 1 1 1
   
5. 0 1 1
   
6. 0 1 0
   
7. 0 1 0
   
8. 1 1 0
   
9. 1 1 0
   
10. 0 0 0
    
11. end

复制代码