Frequencies for first 10,000 rows of nofu variable in nhamcsed2009 dataset :

  no follow |
 up planned |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,443       94.43       94.43
          1 |        557        5.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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