Frequencies for first 10,000 rows of episode variable in nhamcsed2002 dataset :

episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          Blank |        273        2.73        2.73
  Initial visit |      8,687       86.87       89.60
Follow-up visit |        566        5.66       95.26
        Unknown |        474        4.74      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

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