Frequencies for first 10,000 rows of ca_limb variable in natlterr2007 dataset :

       Limb |
  Reduction |
 Defect RFP |
641=f_ca_li |
       mb R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,163       61.63       61.63
          N |      3,834       38.34       99.97
          U |          1        0.01       99.98
          Y |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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