Frequencies for first 10,000 rows of arthrit variable in nhamcsopd1995 dataset :

       does |
    patient |
     have - |
  arthritis |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,366       93.66       93.66
          1 |        634        6.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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