Frequencies for first 10,000 rows of episode variable in namcs2001 dataset :

episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          Blank |        868        8.68        8.68
  Initial visit |      2,715       27.15       35.83
Follow-up visit |      5,077       50.77       86.60
        Unknown |        144        1.44       88.04
 Not applicable |      1,196       11.96      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

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