Frequencies for first 10,000 rows of ca_mnsb variable in natlterr2013 dataset :

Meningomyel |
ocele/Spina |
 Bifida RFP |
636=f_ca_me |
      nin R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,557       85.57       96.34
          U |        363        3.63       99.97
          Y |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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