Frequencies for first 10,000 rows of totproc variable in nhamcsed2002 dataset :

      total |
  number of |
 procedures |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,124       51.24       51.24
          1 |      3,659       36.59       87.83
          2 |        449        4.49       92.32
          3 |         41        0.41       92.73
          4 |         10        0.10       92.83
          7 |          1        0.01       92.84
         99 |        716        7.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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