Frequencies for first 10,000 rows of major variable in nhamcsopd2011 dataset :

         Major reason for this visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               Blank |        228        2.28        2.28
New problem (less than 3 mos. onset) |      2,409       24.09       26.37
            Chronic problem, routine |      3,627       36.27       62.64
           Chronic problem, flare-up |        722        7.22       69.86
                   Pre-/Post-surgery |        566        5.66       75.52
                     Preventive care |      2,448       24.48      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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