Frequencies for first 10,000 rows of totdiag variable in nhamcsed2009 dataset :

      total |
  number of |
tests/servi |
        ces |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        215        2.15        2.15
          0 |      3,090       30.90       33.05
          1 |      2,161       21.61       54.66
          2 |        815        8.15       62.81
          3 |        575        5.75       68.56
          4 |        447        4.47       73.03
          5 |        417        4.17       77.20
          6 |        453        4.53       81.73
          7 |        412        4.12       85.85
          8 |        440        4.40       90.25
          9 |        362        3.62       93.87
         10 |        273        2.73       96.60
         11 |        147        1.47       98.07
         12 |        110        1.10       99.17
         13 |         53        0.53       99.70
         14 |         19        0.19       99.89
         15 |          8        0.08       99.97
         16 |          1        0.01       99.98
         17 |          1        0.01       99.99
         18 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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