Frequencies for first 10,000 rows of major variable in namcs1997 dataset :

           major reason for the visit |      Freq.     Percent        Cum.
--------------------------------------+-----------------------------------
                        Acute problem |      3,662       36.62       36.62
             Chronic problem, routine |      3,334       33.34       69.96
             Chronic problem, flareup |      1,107       11.07       81.03
Pre- or post-surgery, injury followup |        598        5.98       87.01
                     Non-illness care |      1,100       11.00       98.01
                     Blank or unknown |        199        1.99      100.00
--------------------------------------+-----------------------------------
                                Total |     10,000      100.00

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