Frequencies for first 10,000 rows of major variable in nhamcsopd2002 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    Blank |        613        6.13        6.13
            Acute problem |      2,139       21.39       27.52
 Chronic problem, routine |      3,568       35.68       63.20
Chronic problem, flare-up |        693        6.93       70.13
         Pre/Post-surgery |        549        5.49       75.62
          Preventive care |      2,438       24.38      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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