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What is twin IQ?

The 244 individual twins' IQ's are normally distributed, with the mean = 96.82, SD = 14.16. The mean absolute difference between twins is 6.60 (SD = 5.20), the largest difference being 24 IQ points.

link.springer.com - IQ's of Identical Twins Reared Apart | SpringerLink

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A new analysis of the original data from the four largest studies (Newman, Freeman and Holzinger, 1937; Shields, 1962; Juel-Nielsen, 1965; Burt, 1955) of the intelligence of monozygotic twins reared apart, totaling 122 twin pairs, leads to conclusions not found in the original studies or in previous reviews of them. Statistical analysis of the twin differences reveals no significant differences among the twin samples in the four studies; all of them can thus be viewed statistically as samples from the same population. They can therefore be pooled for more detailed and powerful statistical treatment. The 244 individual twins’ IQ’s are normally distributed, with the mean = 96.82, SD = 14.16. The mean absolute difference between twins is 6.60 (SD = 5.20), the largest difference being 24 IQ points. The frequency of large twin differences is no more than would be expected from the normal probability curve. The overall intra-class correlation between twins is.824, which may be interpreted as an upper-bound estimate of the heritability (h2) of IQ in the English, Danish, and North American Caucasian, populations sampled in these studies. The absolute differences between twins (attributable to nongenetic effects and measurement error) closely approximate the chi distribution; this fact indicates that environmental effects are normally distributed. That is, if P = G + E (where P is phenotypic value, G is genotypic value, and E is environmental effect), it can be concluded that for this population P, G, and E, are each normally distributed. There is no evidence of asymmetry or of threshold conditions for the effects of environment on IQ. The lack of a significant correlation (r = -0.15) between twin-pair means and twin-pair differences indicates that magnitude of differential environmental effects is not systematically related to intelligence level of twin pairs.

Keywords

Twin Pair

Scatter Diagram

Behavior Genetic

Twin Sample

Twin Correlation

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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What are siblings 14 months apart called?

Irish twins is a slang expression for siblings born less than a year apart from each other.

dictionary.com - Irish twins Meaning & Origin | Slang by Dictionary.com

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Irish twins can name actual twins … who are Irish. As a slang term, however, Irish twins dates back to at least the 1850s. Early instances appears in American newspapers, suggesting the term coincides with the rise of Irish immigration to the US during the Great Famine—and xenophobic attitudes toward the newly arrived immigrants. The expression comes from the stereotype that Irish families have a lot of children and have them close together. One writer in the 19th-century even called Irish women “excellent brood wives.” The stereotype may well be Protestant in origin, as Irish twins are also called Catholic twins—the Irish traditionally being Catholic and birth control historically forbidden. Since the 19th century, Irish twins has gone on to describe any siblings, whether they are Irish or not, born less than a year apart, give or take. In 2008, Shiloh and Rider King Strong directed and starred in a short film called “Irish Twins” in which they play Irish twins and take their father’s ashes to Ireland.

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