Frequencies for first 10,000 rows of nofu variable in nhamcsopd2004 dataset :

  no follow |
 up planned |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,541       95.41       95.41
        yes |        459        4.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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