Frequencies for first 10,000 rows of prescr4 variable in namcs1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        955        9.55        9.55
          2 |        127        1.27       10.82
          3 |         78        0.78       11.60
          . |      8,840       88.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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