Frequencies for first 10,000 rows of nofu variable in nhamcsed2001 dataset :

no followup |
    planned |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,167       91.67       91.67
          1 |        833        8.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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