Frequencies for first 10,000 rows of ca_disor variable in natlterr2005 dataset :

  Suspected |
Chromosonal |
 Disorder R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,255       62.55       62.55
          C |          2        0.02       62.57
          N |      3,742       37.42       99.99
          P |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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