Frequencies for first 10,000 rows of major variable in nhamcsopd2006 dataset :

   major reason for visit |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
                    Blank |        191        1.91        1.91
            Acute problem |      2,738       27.38       29.29
 Chronic problem, routine |      3,722       37.22       66.51
Chronic problem, flare-up |        716        7.16       73.67
         Pre/Post-surgery |        634        6.34       80.01
          Preventive care |      1,999       19.99      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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