D002. IQ scores of 32 paris of twins

The data file can be downloaded here:

This dataset contains the IQ scores (iq) of identical (monozygotic) twins (twin) that were separated early in life and reared apart. Univitelline twins are very important for genetic studies because they share virtually identical genotype. The data corresponds to a total of 32 pairs (pair) of twins where one of the members (twin = A) was reared by their natural parent, and the other (twin = B) was reared by a relative or other person (McClave and Sincich 2009).

d002 <- read.table(here::here("data", "TWINLONG.txt"), header = TRUE)
pair twin iq
112 A 113
112 B 109
114 A 94
114 B 100
126 A 99
126 B 86
132 A 77
132 B 80