Frequencies for first 10,000 rows of major variable in nhamcsopd2001 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    Blank |        499        4.99        4.99
            Acute problem |      2,515       25.15       30.14
 Chronic problem, routine |      3,519       35.19       65.33
Chronic problem, flare-up |        760        7.60       72.93
         Pre/Post-surgery |        434        4.34       77.27
          Preventive care |      2,273       22.73      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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