Frequencies for first 10,000 rows of major variable in namcs2012 dataset :

         Major reason for this visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               Blank |        106        1.06        1.06
New problem (less than 3 mos. onset) |      3,254       32.54       33.60
            Chronic problem, routine |      3,284       32.84       66.44
           Chronic problem, flare-up |        804        8.04       74.48
                   Pre-/Post-surgery |        676        6.76       81.24
                     Preventive care |      1,876       18.76      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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