Frequencies for first 10,000 rows of adactyly variable in natl2001 dataset :

Polydactyly |
/Syndactyly |
  /Adactyly |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         11        0.11        0.11
          2 |      9,987       99.87       99.98
          8 |          1        0.01       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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