Frequencies for first 10,000 rows of whocomp variable in nhamcsopd2002 dataset :

        who |
  completed |
the patient |
     record |
     forms? |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,291       62.91       62.91
          2 |        170        1.70       64.61
          3 |      2,864       28.64       93.25
          5 |        422        4.22       97.47
          6 |        253        2.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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