Frequencies for first 10,000 rows of whocomp variable in nhamcsopd2001 dataset :

        who |
  completed |
the patient |
     record |
     forms? |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,466       64.66       64.66
          2 |         32        0.32       64.98
          3 |      2,417       24.17       89.15
          4 |         32        0.32       89.47
          5 |        391        3.91       93.38
          6 |        662        6.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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