Frequencies for first 10,000 rows of major variable in nhamcsopd1997 dataset :

              major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                       Acute problem |      2,553       25.53       25.53
            Chronic problem, routine |      3,144       31.44       56.97
            Chronic problem, flareup |        606        6.06       63.03
Pre- or post-surgery/injury followup |        683        6.83       69.86
                    Non-illness care |      2,716       27.16       97.02
                    Blank or unknown |        298        2.98      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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