Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd2002 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,739       17.39       17.39
          2 |        195        1.95       19.34
          3 |        137        1.37       20.71
          . |      7,929       79.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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