Frequencies for first 10,000 rows of nofu variable in nhamcsopd2001 dataset :

  no follow |
 up planned |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,518       95.18       95.18
          1 |        482        4.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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