Frequencies for first 10,000 rows of uca_adactyly variable in natl2004 dataset :

Polydactyly |
/Syndactyly |
/Adactyly U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          6        0.06        0.06
          2 |      8,768       87.68       87.74
          9 |      1,226       12.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016