Frequencies for first 10,000 rows of major variable in namcs2004 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    Blank |        284        2.84        2.84
            Acute problem |      3,304       33.04       35.88
 Chronic problem, routine |      3,582       35.82       71.70
Chronic problem, flare-up |        943        9.43       81.13
         Pre/Post-surgery |        787        7.87       89.00
          Preventive care |      1,100       11.00      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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