stata对时间范围内的值求均值（dataex）

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1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str6 code int date str20 instution double eps1
   
4. "000001" 17910 "爱建证券"       .1977
   
5. "000001" 17910 "东兴证券"       .1977
   
6. "000001" 17910 "第一创业"       .1977
   
7. "000001" 17911 "宏源证券"       .1977
   
8. "000001" 17976 "信达证券"       .1977
   
9. "000001" 17976 "北京高华证券" .1977
   
10. "000001" 18013 "兴业证券"       .1977
    
11. "000001" 18057 "海通证券"       .1977
    
12. "000001" 18061 "渤海证券"       .1977
    
13. "000001" 18063 "东北证券"       .1977
    
14. "000001" 18100 "南京证券"       .1977
    
15. "000001" 18130 "申银万国"       .1977
    
16. "000001" 18130 "招商证券"       .1977
    
17. "000001" 18130 "方正证券"       .1977
    
18. "000001" 18130 "国盛证券"       .1977
    
19. "000001" 18130 "西南证券"       .1977
    
20. "000001" 18132 "国都证券"       .1977
    
21. "000001" 18133 "瑞银证券"       .1977
    
22. "000001" 18133 "东海证券"       .1977
    
23. "000001" 18133 "上海证券"       .1977
    
24. end
    
25. format %td date

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想问问如何求某一时间范围内如2010.1.1-2010.2.1内eps2的平均值
同时想数2010.1.1-2010.2.1内变量的个数
拜托了，救救孩子，感恩！

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关键词：Stata Data tata including generated

1. egen meaneps=mean(eps1) if date>`=td(1jan2009)'&date<`=td(1Jul2009)'
   
2. . count if date>`=td(1jan2009)'&date<`=td(1Jul2009)'

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