Frequencies for first 10,000 rows of form1 variable in namcs2000 dataset :

         is |
 medication |
  #1 from a |
  formulary |
      list? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        660        6.60        6.60
          1 |      1,892       18.92       25.52
          2 |      4,130       41.30       66.82
          3 |      3,318       33.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016