Frequencies for first 10,000 rows of major variable in nhamcsopd2000 dataset :

              major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                       Acute problem |      2,936       29.36       29.36
            Chronic problem, routine |      3,471       34.71       64.07
            Chronic problem, flareup |        616        6.16       70.23
Pre- or post-surgery/injury followup |        636        6.36       76.59
                    Non-illness care |      2,029       20.29       96.88
                    Blank or unknown |        312        3.12      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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