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

  Suspected |
Chromosonal |
   Disorder |
        RFP |
645=f_ca_ch |
      rom R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,656       46.56       46.56
          N |      4,368       43.68       90.24
          P |          3        0.03       90.27
          U |        973        9.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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