Frequencies for first 10,000 rows of major variable in nhamcsopd2005 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    blank |        111        1.11        1.11
            acute problem |      2,917       29.17       30.28
 chronic problem, routine |      3,510       35.10       65.38
chronic problem, flare-up |        853        8.53       73.91
         pre/post-surgery |        502        5.02       78.93
          preventive care |      2,107       21.07      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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