Frequencies for first 10,000 rows of cpr variable in nhamcsed2007 dataset :

        cpr |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,994       99.94       99.94
        yes |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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