Frequencies for first 10,000 rows of ca_disor variable in natl2013 dataset :

  Suspected |
Chromosonal |
   Disorder |
        RFP |
645=f_ca_ch |
      rom R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,996       99.96       99.96
          P |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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