Frequencies for first 10,000 rows of nofu variable in nhamcsed2007 dataset :

  no follow |
 up planned |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,705       97.05       97.05
        yes |        295        2.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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