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

Hypospadias |
        RFP |
646=f_ca_hy |
      pos R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      6,365       63.65       89.01
          U |      1,096       10.96       99.97
          Y |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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