Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd1992 dataset :

Prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,072       10.72       10.72
          2 |        189        1.89       12.61
          3 |        184        1.84       14.45
          . |      8,555       85.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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