Frequencies for first 10,000 rows of totdiag variable in nhamcsed1997 dataset :

 total # of |
diagnostic/ |
  screening |
   services |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,194       11.94       11.94
          1 |      2,475       24.75       36.69
          2 |      2,355       23.55       60.24
          3 |      1,348       13.48       73.72
          4 |        843        8.43       82.15
          5 |        596        5.96       88.11
          6 |        412        4.12       92.23
          7 |        333        3.33       95.56
          8 |        261        2.61       98.17
          9 |        121        1.21       99.38
         10 |         35        0.35       99.73
         11 |         15        0.15       99.88
         12 |          3        0.03       99.91
         13 |          2        0.02       99.93
         14 |          1        0.01       99.94
         99 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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