or wordsum scores, rather.

donnacha thinks that i make too much out of any possible differences between different groups that came Out of Ireland — scots irish vs. native irish, for example.

they look different in the gss though.

if we look at the mean wordsum scores for protestant irish-americans vs. roman catholic irish-americans, they look like this:

protestant irish-americans = 6.08
roman catholic irish-americans = 6.99

now wordsum scores are not the exact equivalents of iq scores, but they are an ok proxy. (to convert wordsum scores to iq scores, see the awesome epigone.) in any case, the point is that the scores between different sub-populations of irish-americans are different.

why? i dunno.

but i can tell you that the largest group of gss protestant-irish (24% of the total) is found in the south atlantic region of the u.s. (virginia, west virgina, the carolinas, etc.) and another 14% are in the east south central region (kentucky, tennessee, etc.), so i’m gonna call this group as being largely scots-irish — hackett fischer’s backcountry folks.

meanwhile, a full 32% of gss roman catholic irish-americans grew up in the mid-atlantic region (new york, new jersey, pennsylvania). another 21% are in the east north central region (illinois, wisconsin, michigan). by virtue of their religion and their settlement patterns, i’m gonna call this group as being largely native irish.

so i think that there are differences between scots-irish folks and native irish — at least in the u.s.

why there should be a difference in iq between the two groups, i’m not sure. inbreeding depression? the native irish and the lowland scots (the ancestors of the scots-irish) both had long histories of inbreeding. and a lot of the scots-irish in the u.s. certainly kept right on inbreeding after they got here. but the irish back in ireland seem to have still been inbreeding probably into the late nineteenth/early twentieth century, too. not by the mid-twentieth century, though.

dunno. that might not be it at all. perhaps the roman catholic irish simply started outbreeding more once they got to the u.s. unlike the scots-irish. again, dunno. maybe it’s something else.
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speaking of protestant vs. roman catholic iqs, here are the wordsum scores for german-americans:

protestant german-americans = 6.17
roman-catholic german-americans = 6.50

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gss nesstar searches:

1) RACE (OF RESPONDENT) + ETHNIC (COUNTRY OF FAMILY ORIGIN) + RELIGION (IN WHICH RAISED) + WORDSUM
2) REGION OF RESIDENCE (AGE 16) + RACE (OF RESPONDENT) + ETHNIC (COUNTRY OF FAMILY ORIGIN) + RELIGION (IN WHICH RAISED)

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