Frequencies for first 10,000 rows of episode variable in nhamcsed2003 dataset :

episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          blank |        168        1.68        1.68
  initial visit |      8,901       89.01       90.69
follow-up visit |        564        5.64       96.33
        unknown |        367        3.67      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

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