Frequencies for first 10,000 rows of totdiag variable in namcs1995 dataset :

 total # of |
diagnostic/ |
  screening |
   services |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,173       21.73       21.73
          1 |      3,782       37.82       59.55
          2 |      2,175       21.75       81.30
          3 |        933        9.33       90.63
          4 |        404        4.04       94.67
          5 |        210        2.10       96.77
          6 |        150        1.50       98.27
          7 |         87        0.87       99.14
          8 |         44        0.44       99.58
          9 |         28        0.28       99.86
         10 |          7        0.07       99.93
         11 |          4        0.04       99.97
         12 |          1        0.01       99.98
         13 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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