Frequencies for first 10,000 rows of drug_seq variable in drug2015q1 dataset :

     Unique |
 number for |
identifying |
 a drug for |
     a Case |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,229       12.29       12.29
          2 |      1,027       10.27       22.56
          3 |        908        9.08       31.64
          4 |        774        7.74       39.38
          5 |        681        6.81       46.19
          6 |        613        6.13       52.32
          7 |        547        5.47       57.79
          8 |        476        4.76       62.55
          9 |        436        4.36       66.91
         10 |        381        3.81       70.72
         11 |        340        3.40       74.12
         12 |        300        3.00       77.12
         13 |        272        2.72       79.84
         14 |        233        2.33       82.17
         15 |        199        1.99       84.16
         16 |        174        1.74       85.90
         17 |        150        1.50       87.40
         18 |        130        1.30       88.70
         19 |        121        1.21       89.91
         20 |        103        1.03       90.94
         21 |         93        0.93       91.87
         22 |         86        0.86       92.73
         23 |         73        0.73       93.46
         24 |         63        0.63       94.09
         25 |         51        0.51       94.60
         26 |         49        0.49       95.09
         27 |         41        0.41       95.50
         28 |         41        0.41       95.91
         29 |         35        0.35       96.26
         30 |         33        0.33       96.59
         31 |         29        0.29       96.88
         32 |         27        0.27       97.15
         33 |         26        0.26       97.41
         34 |         22        0.22       97.63
         35 |         20        0.20       97.83
         36 |         19        0.19       98.02
         37 |         18        0.18       98.20
         38 |         16        0.16       98.36
         39 |         15        0.15       98.51
         40 |         12        0.12       98.63
         41 |         12        0.12       98.75
         42 |         10        0.10       98.85
         43 |          9        0.09       98.94
         44 |          9        0.09       99.03
         45 |          8        0.08       99.11
         46 |          7        0.07       99.18
         47 |          7        0.07       99.25
         48 |          7        0.07       99.32
         49 |          7        0.07       99.39
         50 |          7        0.07       99.46
         51 |          5        0.05       99.51
         52 |          5        0.05       99.56
         53 |          5        0.05       99.61
         54 |          5        0.05       99.66
         55 |          4        0.04       99.70
         56 |          3        0.03       99.73
         57 |          2        0.02       99.75
         58 |          2        0.02       99.77
         59 |          2        0.02       99.79
         60 |          2        0.02       99.81
         61 |          2        0.02       99.83
         62 |          2        0.02       99.85
         63 |          2        0.02       99.87
         64 |          2        0.02       99.89
         65 |          2        0.02       99.91
         66 |          2        0.02       99.93
         67 |          2        0.02       99.95
         68 |          2        0.02       99.97
         69 |          1        0.01       99.98
         70 |          1        0.01       99.99
         71 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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