Frequencies for first 10,000 rows of totdiag variable in nhamcsed1999 dataset :

 total # of |
diagnostic/ |
  screening |
   services |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        999        9.99        9.99
          1 |      2,758       27.58       37.57
          2 |      2,285       22.85       60.42
          3 |      1,347       13.47       73.89
          4 |        896        8.96       82.85
          5 |        660        6.60       89.45
          6 |        452        4.52       93.97
          7 |        311        3.11       97.08
          8 |        160        1.60       98.68
          9 |         76        0.76       99.44
         10 |         38        0.38       99.82
         11 |         11        0.11       99.93
         12 |          5        0.05       99.98
         13 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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