Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,443       44.43       44.43
          2 |        891        8.91       53.34
          3 |        510        5.10       58.44
          . |      4,156       41.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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