Frequencies for first 10,000 rows of nofu variable in nhamcsopd2006 dataset :

  no follow |
         up |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,424       94.24       94.24
        Yes |        576        5.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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