Frequencies for first 10,000 rows of totdiag variable in nhamcsopd1995 dataset :

 total # of |
diagnostic/ |
  screening |
   services |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,668       26.68       26.68
          1 |      3,411       34.11       60.79
          2 |      1,868       18.68       79.47
          3 |      1,086       10.86       90.33
          4 |        512        5.12       95.45
          5 |        226        2.26       97.71
          6 |        120        1.20       98.91
          7 |         67        0.67       99.58
          8 |         25        0.25       99.83
          9 |         13        0.13       99.96
         10 |          2        0.02       99.98
         11 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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