Frequencies for first 10,000 rows of ca_mnsb variable in natlterr2011 dataset :

Meningomyel |
ocele/Spina |
 Bifida RFP |
636=f_ca_me |
      nin R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      6,368       63.68       89.04
          U |      1,096       10.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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