Frequencies for first 10,000 rows of phys variable in namcs1996 dataset :

  physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        301        3.01        3.01
          1 |      9,699       96.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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