Frequencies for first 10,000 rows of dose_freq variable in drug2018q1 dataset :

   Code for |
  Frequency |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,310       63.10       63.10
     /cycle |          3        0.03       63.13
        /hr |          1        0.01       63.14
       /min |          3        0.03       63.17
     /month |         76        0.76       63.93
        /wk |        184        1.84       65.77
        /yr |          1        0.01       65.78
         1X |          9        0.09       65.87
        BID |        727        7.27       73.14
        BIW |         22        0.22       73.36
       Q12H |         36        0.36       73.72
        Q2H |          1        0.01       73.73
        Q3W |         57        0.57       74.30
        Q4H |         14        0.14       74.44
        Q6H |          8        0.08       74.52
        Q8H |          6        0.06       74.58
         QD |      2,201       22.01       96.59
        QID |         39        0.39       96.98
        QOD |         14        0.14       97.12
        QOW |        123        1.23       98.35
        TID |        158        1.58       99.93
        TIW |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Jun 2018