Frequencies for first 10,000 rows of drug_seq variable in drug2012q4 dataset :

     Unique |
 number for |
identifying |
 a drug for |
     a Case |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,500       15.00       15.00
          2 |      1,210       12.10       27.10
          3 |      1,029       10.29       37.39
          4 |        872        8.72       46.11
          5 |        761        7.61       53.72
          6 |        663        6.63       60.35
          7 |        560        5.60       65.95
          8 |        470        4.70       70.65
          9 |        407        4.07       74.72
         10 |        329        3.29       78.01
         11 |        273        2.73       80.74
         12 |        228        2.28       83.02
         13 |        184        1.84       84.86
         14 |        162        1.62       86.48
         15 |        144        1.44       87.92
         16 |        130        1.30       89.22
         17 |        121        1.21       90.43
         18 |        104        1.04       91.47
         19 |         85        0.85       92.32
         20 |         74        0.74       93.06
         21 |         60        0.60       93.66
         22 |         55        0.55       94.21
         23 |         50        0.50       94.71
         24 |         47        0.47       95.18
         25 |         42        0.42       95.60
         26 |         37        0.37       95.97
         27 |         35        0.35       96.32
         28 |         34        0.34       96.66
         29 |         29        0.29       96.95
         30 |         24        0.24       97.19
         31 |         21        0.21       97.40
         32 |         20        0.20       97.60
         33 |         20        0.20       97.80
         34 |         18        0.18       97.98
         35 |         17        0.17       98.15
         36 |         16        0.16       98.31
         37 |         16        0.16       98.47
         38 |         16        0.16       98.63
         39 |         14        0.14       98.77
         40 |         13        0.13       98.90
         41 |         12        0.12       99.02
         42 |         11        0.11       99.13
         43 |          9        0.09       99.22
         44 |          9        0.09       99.31
         45 |          8        0.08       99.39
         46 |          7        0.07       99.46
         47 |          7        0.07       99.53
         48 |          6        0.06       99.59
         49 |          5        0.05       99.64
         50 |          4        0.04       99.68
         51 |          4        0.04       99.72
         52 |          4        0.04       99.76
         53 |          4        0.04       99.80
         54 |          4        0.04       99.84
         55 |          3        0.03       99.87
         56 |          3        0.03       99.90
         57 |          3        0.03       99.93
         58 |          2        0.02       99.95
         59 |          2        0.02       99.97
         60 |          2        0.02       99.99
         61 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Apr 2017