Frequencies for first 10,000 rows of totther variable in nhamcsopd2000 dataset :

  total # of therapeutic/preventive |
                           services |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                                  0 |      5,625       56.25       56.25
                                  1 |      2,086       20.86       77.11
                                  2 |      1,318       13.18       90.29
                                  3 |        425        4.25       94.54
                                  4 |        161        1.61       96.15
                                  5 |         68        0.68       96.83
                                  6 |         36        0.36       97.19
                                  7 |         15        0.15       97.34
                                  8 |          4        0.04       97.38
                                  9 |          2        0.02       97.40
All boxes blank, including None box |        260        2.60      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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