Frequencies for first 10,000 rows of major variable in nhamcsopd2003 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    blank |        235        2.35        2.35
            acute problem |      2,946       29.46       31.81
 chronic problem, routine |      3,571       35.71       67.52
chronic problem, flare-up |        752        7.52       75.04
         pre/post-surgery |        527        5.27       80.31
          preventive care |      1,969       19.69      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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