Frequencies for first 10,000 rows of episode variable in namcs2004 dataset :

episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          Blank |        421        4.21        4.21
  Initial visit |      2,846       28.46       32.67
Follow-up visit |      5,467       54.67       87.34
        Unknown |        166        1.66       89.00
 Not applicable |      1,100       11.00      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

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