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

        who |
  completed |
the patient |
     record |
     forms? |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |         98        0.98        0.98
          1 |      5,869       58.69       59.67
          2 |        457        4.57       64.24
          3 |      2,948       29.48       93.72
          4 |        208        2.08       95.80
          5 |        420        4.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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