Frequencies for first 10,000 rows of totproc variable in nhamcsed2006 dataset :

             total number of procedures |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                      0 |      4,888       48.88       48.88
                                      1 |      3,885       38.85       87.73
                                      2 |        595        5.95       93.68
                                      3 |         63        0.63       94.31
                                      4 |         14        0.14       94.45
                                      5 |          3        0.03       94.48
'none' box and all item fields are blan |        552        5.52      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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