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

      total |
  number of |
 procedures |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        376        3.76        3.76
          0 |      5,315       53.15       56.91
          1 |      3,630       36.30       93.21
          2 |        577        5.77       98.98
          3 |         86        0.86       99.84
          4 |         13        0.13       99.97
          5 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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