Frequencies for first 10,000 rows of major variable in nhamcsopd1998 dataset :

              major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                       Acute problem |      2,789       27.89       27.89
            Chronic problem, routine |      3,529       35.29       63.18
            Chronic problem, flareup |        500        5.00       68.18
Pre- or post-surgery/injury followup |        510        5.10       73.28
                    Non-illness care |      2,378       23.78       97.06
                    Blank or unknown |        294        2.94      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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