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

      Staff |
  physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,775       27.75       27.75
          1 |      7,225       72.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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