Frequencies for first 10,000 rows of ca_mnsb variable in natlterr2005 dataset :

Meningomyel |
ocele/Spina |
   Bifida R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,255       62.55       62.55
          N |      3,743       37.43       99.98
          Y |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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