Frequencies for first 10,000 rows of adactyly variable in natl1989 dataset :

Polydactyly |
/Syndactyly |
  /Adactyly |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         18        0.18        0.18
          2 |      9,745       97.45       97.63
          9 |        237        2.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016