Frequencies for first 10,000 rows of drug_seq variable in drug2013q2 dataset :

     Unique |
 number for |
identifying |
 a drug for |
     a Case |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,576       15.76       15.76
          2 |      1,237       12.37       28.13
          3 |        990        9.90       38.03
          4 |        815        8.15       46.18
          5 |        669        6.69       52.87
          6 |        564        5.64       58.51
          7 |        464        4.64       63.15
          8 |        392        3.92       67.07
          9 |        334        3.34       70.41
         10 |        290        2.90       73.31
         11 |        262        2.62       75.93
         12 |        234        2.34       78.27
         13 |        206        2.06       80.33
         14 |        177        1.77       82.10
         15 |        165        1.65       83.75
         16 |        144        1.44       85.19
         17 |        129        1.29       86.48
         18 |        117        1.17       87.65
         19 |        104        1.04       88.69
         20 |         96        0.96       89.65
         21 |         86        0.86       90.51
         22 |         80        0.80       91.31
         23 |         75        0.75       92.06
         24 |         71        0.71       92.77
         25 |         64        0.64       93.41
         26 |         61        0.61       94.02
         27 |         53        0.53       94.55
         28 |         48        0.48       95.03
         29 |         42        0.42       95.45
         30 |         38        0.38       95.83
         31 |         35        0.35       96.18
         32 |         32        0.32       96.50
         33 |         28        0.28       96.78
         34 |         25        0.25       97.03
         35 |         22        0.22       97.25
         36 |         21        0.21       97.46
         37 |         20        0.20       97.66
         38 |         17        0.17       97.83
         39 |         18        0.18       98.01
         40 |         16        0.16       98.17
         41 |         17        0.17       98.34
         42 |         16        0.16       98.50
         43 |         15        0.15       98.65
         44 |         14        0.14       98.79
         45 |         11        0.11       98.90
         46 |         12        0.12       99.02
         47 |         10        0.10       99.12
         48 |         11        0.11       99.23
         49 |         10        0.10       99.33
         50 |          9        0.09       99.42
         51 |          8        0.08       99.50
         52 |          7        0.07       99.57
         53 |          8        0.08       99.65
         54 |          6        0.06       99.71
         55 |          5        0.05       99.76
         56 |          5        0.05       99.81
         57 |          5        0.05       99.86
         58 |          3        0.03       99.89
         59 |          2        0.02       99.91
         60 |          2        0.02       99.93
         61 |          1        0.01       99.94
         62 |          1        0.01       99.95
         63 |          1        0.01       99.96
         64 |          1        0.01       99.97
         65 |          1        0.01       99.98
         66 |          1        0.01       99.99
         67 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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