Frequencies for first 10,000 rows of episode variable in namcs2002 dataset :

Episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          Blank |        706        7.06        7.06
  Initial visit |      3,018       30.18       37.24
Follow-up visit |      4,862       48.62       85.86
        Unknown |        131        1.31       87.17
 Not applicable |      1,283       12.83      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

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