Frequencies for first 10,000 rows of major variable in nhamcsopd1999 dataset :

              major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                       Acute problem |      3,160       31.60       31.60
            Chronic problem, routine |      3,002       30.02       61.62
            Chronic problem, flareup |        524        5.24       66.86
Pre- or post-surgery/injury followup |        695        6.95       73.81
                    Non-illness care |      2,329       23.29       97.10
                    Blank or unknown |        290        2.90      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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