Frequencies for first 10,000 rows of admtphys variable in nhamcsed2009 dataset :

  admitting |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |         35        0.35        0.35
         -7 |      8,552       85.52       85.87
          1 |        457        4.57       90.44
          2 |        434        4.34       94.78
          3 |        522        5.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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