Frequencies for first 10,000 rows of totproc variable in nhamcsed2005 dataset :

             total number of procedures |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                      0 |      4,364       43.64       43.64
                                      1 |      4,022       40.22       83.86
                                      2 |        802        8.02       91.88
                                      3 |        118        1.18       93.06
                                      4 |         15        0.15       93.21
'none' box and all item fields are blan |        679        6.79      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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