Frequencies for first 10,000 rows of cpr variable in nhamcsed2008 dataset :

        cpr |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,990       99.90       99.90
        yes |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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