Frequencies for first 10,000 rows of prescr4 variable in namcs2005 dataset :

prescriptio |
   n status |
   code for |
     med #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,810       18.10       18.10
          2 |        231        2.31       20.41
          3 |        130        1.30       21.71
          . |      7,829       78.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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