Frequencies for first 10,000 rows of nofu variable in nhamcsopd2007 dataset :

  no follow |
         up |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,619       96.19       96.19
        yes |        381        3.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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