让巧妇有米可炊 (提問時，如何附上適當的資料)

600108
600467
600257
600975
601118
300106
600257
  2299
   713
  2299

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input long Stkcd
   
4. 600108
   
5. 600467
   
6. 600257
   
7. 600975
   
8. 601118
   
9. 300106
   
10. 600257
    
11.   2299
    
12.    713
    
13.   2299
    
14. end

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学到了

* Example generated by -dataex-. To install: ssc install dataex
clear
input long stkcd byte year float(roaa roaa1)
2  1  .038913  .053125
2  2  .046727  .038913
2  3  .040993  .046727
2  4   .03916  .040993
2  5  .041348   .03916
2  6  .038183  .041348
2  7  .037937  .038183
2  8   .04245  .037937
2  9  .034129   .04245
2 10  .031929  .034129
2 11  .032234  .031929
9  1  .044634  .056781
9  2  .054465  .044634
9  3  .044051  .054465
9  4   .03228  .044051
9  5  .023331   .03228
9  6   .03263  .023331
9  7  .032091   .03263
9  8  .053324  .032091
9  9    .0194  .053324
9 10  .011924    .0194
9 11  .022281  .011924
11  1  .004659 -.014524
11  2  .034199  .004659
11  3  .060069  .034199
11  4  .073569  .060069
11  5  .094875  .073569
11  6  .077671  .094875
11  7  .107512  .077671
11  8  .035806  .107512
11  9  .053327  .035806
11 10  .115506  .053327
11 11  .101828  .115506
12  1   .04821  .067107
12  2  .083806   .04821
12  3  .128068  .083806
12  4  .087526  .128068
12  5  .025796  .087526
12  6  .107516  .025796
12  7  .055877  .107516
12  8  .034983  .055877
12  9  .046902  .034983
12 10  .042418  .046902
12 11  .024705  .042418
14  1  .026181  .001575
14  2  .047744  .026181
14  3  .048823  .047744
14  4  .035961  .048823
14  5  .016419  .035961
14  6  .018602  .016419
14  7  .028069  .018602
14  8  .024607  .028069
14  9  .015537  .024607
14 10   .00719  .015537
14 11  .080596   .00719
16  1  .026331  .023069
16  2  .010863  .026331
16  3  .006145  .010863
16  4   .00143  .006145
16  5  .002743   .00143
16  6  .003801  .002743
16  7  .003607  .003801
16  8 -.089531  .003607
16  9  .005346 -.089531
16 10  .200068  .005346
16 11   .02027  .202034
21  1  .073061  .137866
21  2  .048991  .073061
21  3  .053452  .048991
21  4  .021297  .053452
21  5   .00083  .021297
21  6  .011574   .00083
21  7  .011111  .011574
21  8  .012601  .011111
21  9  .019095  .012601
21 10  .034573  .019095
21 11  .036383  .034573
25  1  .003002   .00793
25  2  .013285  .003002
25  3  .006542  .013285
25  4  .002191  .006542
25  5  .001507  .002191
25  6  .004305  .001507
25  7  .010624  .004305
25  8   .03657  .010624
25  9  .023228   .03657
25 10  .046876  .023228
25 11  .051945  .046876
26  1  .045115  .059057
26  2  .046426  .045115
26  3  .038587  .046426
26  4  .054997  .038587
26  5  .034766  .054997
26  6  .036565  .034766
26  7  .039943  .036565
26  8  .028739  .039943
26  9   .02756  .028739
26 10  .039839   .02756
26 11   .05107  .039839

如何计算 在Stkcd Accper相同的情况下，Typrep=B时C001020000的值 除以Typrep=A时C001020000的值
* Example generated by -dataex-. To install: ssc install dataex
clear
input str12(Stkcd Accper Typrep) double C001020000
"000002" "1998-12-31" "A" 115207468.33
"000002" "1999-12-31" "A" 158161436.78
"000002" "2000-12-31" "A" 202494288.48
"000002" "2001-12-31" "A" 249028992.99
"000002" "2002-12-31" "A"  248990440.9
"000002" "2003-12-31" "A" 293181094.09
"000002" "2003-12-31" "B"  35491472.27
"000002" "2004-12-31" "A" 351839465.92
"000002" "2004-12-31" "B"  37657496.06
"000002" "2005-12-31" "A" 452287228.49

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str18 make int(price mpg rep78)
   
4. "AMC Concord"   4099 22 3
   
5. "AMC Pacer"     4749 17 3
   
6. "AMC Spirit"    3799 22 .
   
7. "Buick Century" 4816 20 3
   
8. "Buick Electra" 7827 15 4
   
9. end

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1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str4 x float(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

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学习学习

1. clear
   
2. input float(y d k)
   
3.   .509434 .8  .6176471
   
4. .3962264  0 .24705882
   
5. .41509435  0 .19411765
   
6. .33962265  0  .2529412
   
7. .7924528  0 .24705882
   
8. .6792453  0  .1117647
   
9. .26415095 .8  .5529412
   
10. .3773585 .8  .3294118
    
11. .28301886 .8  .4235294
    
12. .3207547 .8 .29411766
    
13. end

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