Frequencies for first 10,000 rows of totther variable in nhamcsopd1999 dataset :

  total # of therapeutic/preventive |
                           services |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                                  0 |      5,943       59.43       59.43
                                  1 |      2,436       24.36       83.79
                                  2 |        989        9.89       93.68
                                  3 |        426        4.26       97.94
                                  4 |        145        1.45       99.39
                                  5 |         46        0.46       99.85
                                  6 |          9        0.09       99.94
                                  7 |          3        0.03       99.97
                                  8 |          2        0.02       99.99
                                  9 |          1        0.01      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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