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

Meningomyel |
ocele/Spina |
 Bifida RFP |
636=f_ca_me |
      nin 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