Frequencies for first 10,000 rows of ca_limb variable in natlterr2010 dataset :

       Limb |
  Reduction |
 Defect RFP |
641=f_ca_li |
       mb R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,656       46.56       46.56
          N |      4,368       43.68       90.24
          U |        973        9.73       99.97
          Y |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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