Frequencies for first 10,000 rows of drug_seq variable in drug2014q1 dataset :

     Unique |
 number for |
identifying |
 a drug for |
     a Case |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,488       14.88       14.88
          2 |      1,200       12.00       26.88
          3 |      1,022       10.22       37.10
          4 |        850        8.50       45.60
          5 |        723        7.23       52.83
          6 |        606        6.06       58.89
          7 |        541        5.41       64.30
          8 |        456        4.56       68.86
          9 |        406        4.06       72.92
         10 |        342        3.42       76.34
         11 |        294        2.94       79.28
         12 |        238        2.38       81.66
         13 |        209        2.09       83.75
         14 |        177        1.77       85.52
         15 |        170        1.70       87.22
         16 |        151        1.51       88.73
         17 |        135        1.35       90.08
         18 |        112        1.12       91.20
         19 |        100        1.00       92.20
         20 |         88        0.88       93.08
         21 |         75        0.75       93.83
         22 |         69        0.69       94.52
         23 |         62        0.62       95.14
         24 |         56        0.56       95.70
         25 |         50        0.50       96.20
         26 |         40        0.40       96.60
         27 |         37        0.37       96.97
         28 |         33        0.33       97.30
         29 |         31        0.31       97.61
         30 |         28        0.28       97.89
         31 |         24        0.24       98.13
         32 |         22        0.22       98.35
         33 |         16        0.16       98.51
         34 |         15        0.15       98.66
         35 |         15        0.15       98.81
         36 |         12        0.12       98.93
         37 |         12        0.12       99.05
         38 |         12        0.12       99.17
         39 |          9        0.09       99.26
         40 |          8        0.08       99.34
         41 |          8        0.08       99.42
         42 |          7        0.07       99.49
         43 |          7        0.07       99.56
         44 |          7        0.07       99.63
         45 |          6        0.06       99.69
         46 |          4        0.04       99.73
         47 |          3        0.03       99.76
         48 |          3        0.03       99.79
         49 |          3        0.03       99.82
         50 |          3        0.03       99.85
         51 |          2        0.02       99.87
         52 |          2        0.02       99.89
         53 |          2        0.02       99.91
         54 |          2        0.02       99.93
         55 |          2        0.02       99.95
         56 |          2        0.02       99.97
         57 |          2        0.02       99.99
         58 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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