Frequencies for first 10,000 rows of totdiag variable in nhamcsopd1996 dataset :

 total # of |
diagnostic/ |
  screening |
   services |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,552       25.52       25.52
          1 |      3,432       34.32       59.84
          2 |      2,131       21.31       81.15
          3 |        990        9.90       91.05
          4 |        422        4.22       95.27
          5 |        231        2.31       97.58
          6 |        126        1.26       98.84
          7 |         55        0.55       99.39
          8 |         34        0.34       99.73
          9 |         18        0.18       99.91
         10 |          3        0.03       99.94
         11 |          5        0.05       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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