Frequencies for first 10,000 rows of major variable in nhamcsopd2010 dataset :

         major reason for this visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               blank |        157        1.57        1.57
new problem (less than 3 mos. onset) |      3,107       31.07       32.64
            chronic problem, routine |      3,372       33.72       66.36
           chronic problem, flare-up |        846        8.46       74.82
                   pre-/post-surgery |        663        6.63       81.45
                     preventive care |      1,855       18.55      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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