Frequencies for first 10,000 rows of refothmd variable in namcs2006 dataset :

   refer to |
   other md |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,095       90.95       90.95
        yes |        905        9.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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