Frequencies for first 10,000 rows of major variable in namcs2003 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    Blank |        216        2.16        2.16
            Acute problem |      3,313       33.13       35.29
 Chronic problem, routine |      3,639       36.39       71.68
Chronic problem, flare-up |      1,037       10.37       82.05
         Pre/Post-surgery |        689        6.89       88.94
          Preventive care |      1,106       11.06      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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