Frequencies for first 10,000 rows of episode variable in nhamcsed2010 dataset :

Episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          blank |        187        1.87        1.87
        unknown |        618        6.18        8.05
  initial visit |      8,473       84.73       92.78
follow-up visit |        722        7.22      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

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