Frequencies for first 10,000 rows of ca_gast variable in natlterr2012 dataset :

Gastroschis |
     is RFP |
640=f_ca_ga |
     stro R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,163       11.63       11.63
          N |      8,399       83.99       95.62
          U |        438        4.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016