Frequencies for first 10,000 rows of major variable in namcs2005 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    Blank |        169        1.69        1.69
              New problem |      4,121       41.21       42.90
 Chronic problem, routine |      2,464       24.64       67.54
Chronic problem, flare-up |        855        8.55       76.09
        Pre-/Post-surgery |        385        3.85       79.94
          Preventive care |      2,006       20.06      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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