Frequencies for first 10,000 rows of nofu variable in namcs2004 dataset :

         no |
  follow-up |
    planned |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,447       94.47       94.47
          1 |        553        5.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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