I’m still so confused(through no fault of your own, I think you’re right, it just doesn’t fit in my head). Let me try to walk through my thought process.
I assume heritability of SAT score is probably different if you sample across USA, or just upper-mid class suburbs or just South Side Chicago, or just rural Eastern Europe, or just Malawi during a famine. Right? Given that environments are pretty radically different.
What heritability score are we using to determine if policy interventions matter or not? Is the first step to make sure that the region we want to improve has an environment that mimics ‘successful’ regions? Heritability would be very high in a homogenous environment(since that’s the only variation), but it goes down as more varied environments are added to the sample. Heritability is very high if we just look at rich area USA schools, lower if you sample all USA and even lower if we sample the whole world?
Also how is this linked to amplitude of effect? Super high heritability of SAT/IQ in say homogenous Denmark, but presumably the actual variation in scores is lower than in a global sample. Is there a way to say genetics account for +/- 5 points of IQ? So if you’re measuring IQs of 95-105 in your area that’s probably all genetic effects and policy interventions can’t do much?
Edit. I realize now that this is mostly Insub’s point below, but less coherent.
I’m still so confused(through no fault of your own, I think you’re right, it just doesn’t fit in my head). Let me try to walk through my thought process.
I assume heritability of SAT score is probably different if you sample across USA, or just upper-mid class suburbs or just South Side Chicago, or just rural Eastern Europe, or just Malawi during a famine. Right? Given that environments are pretty radically different.
What heritability score are we using to determine if policy interventions matter or not? Is the first step to make sure that the region we want to improve has an environment that mimics ‘successful’ regions? Heritability would be very high in a homogenous environment(since that’s the only variation), but it goes down as more varied environments are added to the sample. Heritability is very high if we just look at rich area USA schools, lower if you sample all USA and even lower if we sample the whole world?
Also how is this linked to amplitude of effect? Super high heritability of SAT/IQ in say homogenous Denmark, but presumably the actual variation in scores is lower than in a global sample. Is there a way to say genetics account for +/- 5 points of IQ? So if you’re measuring IQs of 95-105 in your area that’s probably all genetic effects and policy interventions can’t do much?
Edit. I realize now that this is mostly Insub’s point below, but less coherent.