Frequencies for first 10,000 rows of totther variable in nhamcsopd1997 dataset :

  total # of therapeutic/preventive |
                           services |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                                  0 |      5,175       51.75       51.75
                                  1 |      2,852       28.52       80.27
                                  2 |      1,196       11.96       92.23
                                  3 |        415        4.15       96.38
                                  4 |        169        1.69       98.07
                                  5 |         71        0.71       98.78
                                  6 |         66        0.66       99.44
                                  7 |         33        0.33       99.77
                                  8 |          8        0.08       99.85
                                 10 |          1        0.01       99.86
All boxes blank, including None box |         14        0.14      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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