Frequencies for first 10,000 rows of form1 variable in namcs1999 dataset :

         is |
 medication |
  #1 from a |
  formulary |
      list? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        759        7.59        7.59
          1 |      1,710       17.10       24.69
          2 |      3,889       38.89       63.58
          3 |      3,642       36.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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