Generally, consider how hard it is to separate out environmental vs. genetic effects, even in a twins-raised-apart study.
To control for things like the mother's blood chemistry in utero (which the microbiome has a huge impact on) you have to compare monozygotic (identical) to dizygotic (fraternal) twins.
In most of the studies I've seen, by the time you stratify down to look at something like concordance of a psychological trait in identical twins raised apart vs. fraternal twins raised apart, you've got like 30 pairs total and you're way underpowered for analyzing something so complex.
If you're thinking of a particular study, please link it!
This is both incredibly interesting and really well written Stephen!!
ayy thanks!
Fascinating! Thank you
Thanks for making me laugh over breakfast (“absolute unit). Really fascinating and informative article, thank you.
Generally, consider how hard it is to separate out environmental vs. genetic effects, even in a twins-raised-apart study.
To control for things like the mother's blood chemistry in utero (which the microbiome has a huge impact on) you have to compare monozygotic (identical) to dizygotic (fraternal) twins.
In most of the studies I've seen, by the time you stratify down to look at something like concordance of a psychological trait in identical twins raised apart vs. fraternal twins raised apart, you've got like 30 pairs total and you're way underpowered for analyzing something so complex.
If you're thinking of a particular study, please link it!