Frequencies for first 10,000 rows of episode variable in nhamcsopd2004 dataset :

episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          blank |        320        3.20        3.20
  initial visit |      2,674       26.74       29.94
follow-up visit |      4,961       49.61       79.55
        unknown |        128        1.28       80.83
 not applicable |      1,917       19.17      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

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