Frequencies for first 10,000 rows of form1 variable in namcs1998 dataset :

         is |
 medication |
  #1 from a |
  formulary |
      list? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        842        8.42        8.42
          1 |      1,541       15.41       23.83
          2 |      4,118       41.18       65.01
          3 |      3,499       34.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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