Frequencies for first 10,000 rows of phys variable in namcs2007 dataset :

  physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |        434        4.34        4.34
        yes |      9,566       95.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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