Frequencies for first 10,000 rows of ca_limb variable in natl2013 dataset :

       Limb |
  Reduction |
 Defect RFP |
641=f_ca_li |
       mb R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,999       99.99       99.99
          Y |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015