Frequencies for first 10,000 rows of major variable in nhamcsopd2008 dataset :

              major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               blank |        116        1.16        1.16
new problem (less than 3 mos. onset) |      2,808       28.08       29.24
            chronic problem, routine |      3,629       36.29       65.53
           chronic problem, flare-up |        761        7.61       73.14
                   pre-/post-surgery |        732        7.32       80.46
                     preventive care |      1,954       19.54      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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