Frequencies for first 10,000 rows of major variable in namcs1999 dataset :

           major reason for the visit |      Freq.     Percent        Cum.
--------------------------------------+-----------------------------------
                        Acute problem |      3,092       30.92       30.92
             Chronic problem, routine |      3,623       36.23       67.15
             Chronic problem, flareup |        913        9.13       76.28
Pre- or post-surgery, injury followup |      1,044       10.44       86.72
                     Non-illness care |      1,119       11.19       97.91
                     Blank or unknown |        209        2.09      100.00
--------------------------------------+-----------------------------------
                                Total |     10,000      100.00

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