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No pervasive bias here. Just trying to make sense of data. It’s called critical thinking.
Here is Supercomputer’s map which shows that the most typical Germanics (North Dutch, Northwest Germans, Scandinavians, Frisians) are quite close for light eyes:
Dark hazel eyes Martin #5-6 is likely not so uncommon among Irish. I know of a study of genetic traits among 313 Irish Americans from Boston area by Michael Saint-Paul and Michael P. Walsh that found some significant differences from the overall results of Hooton and Dupertuis with Irish adult males. For example brown eyes were found much more common among the Irish-Americans. Saint-Paul and Walsh found 17.25% Martin #1-6 against the 0.5% pure brown found in Ireland. The 3.83% regular light brown eyes Martin #4 found among the Irish-American sample is likely comparable with Hooton & Dupertuis’ figure for pure brown. The authors try to account for this significant discrepancy by noting Western Ireland the predominant area of descent as being relativity darker eyed.
This is the study, although I have only searched it on Google Books snippet view becuase of the paywall:
https://karger.com/books/book/3098/c...rectedFrom=PDF
Google Books:
https://books.google.com/books?newbk...volume&q=irish
Here is Gray & Tocher’s data on Irish schoolchildren in Glasgow (darker hazel shades were counted as dark):
Regarding Irish matching the blondest regions of Scandinavia, this is the Coon quote I think you are referring to:
Hooton & Dupertuis never used scales so exact equivalencies cannot accurately be made. Thus Coon was making a sort of educated guess. By exercising a little cleverness we still have a good idea of how Irish and Norwegians really compare in eye color. Gray & Tocher found 19.8% pure light eyes among roughly 500 Jewish schoolchildren attending school around the Gorbals neighborhood in Glasgow. Karl Pearson found 19.7% Martin #12-16 among 516 alien Jewish boys and he can be particularly trusted to be thorough. Light eyes for Gray & Tocher thus approximately meant Martin #12-16. Bryn found about 72.4% Martin #12-16 among his largest survey of Norwegian recruits.“ the proportion of pure light eyes, Ireland competes successfully with the blondest regions of Scandinavia. Over 46 per cent of the total group has pure light eyes, and of these all but 4 per cent are blue. Very light-mixed eyes (equivalent to Martin #13-14) account for another 30 per cent, while less than one-half of one per cent have pure brown. There is probably no population of equal size in the world which is lighter eyed, and blue eyed, than the Irish. The almost total absence of gray eyes corresponds to the equal paucity of ash-blond hair.”
It is quite clear that when compared with Northern Germanics Irish stand out mainly in terms of pure blue eyes Martin #15-16 rather than light eyes overall. Irish people are not lighter eyed overall than Norwegians or Scandinavians at large. They stand out as distinctly light eyed in a general European context but not in a strictly Northern European context.
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