Frequencies for first 10,000 rows of major variable in namcs2007 dataset :

              major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               blank |        202        2.02        2.02
new problem (less than 3 mos. onset) |      4,211       42.11       44.13
            chronic problem, routine |      2,508       25.08       69.21
           chronic problem, flare-up |        725        7.25       76.46
                   pre-/post-surgery |        187        1.87       78.33
                     preventive care |      2,167       21.67      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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