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Reconsidering the Heritability of Intelligence in Adulthood: Taking Assortative Mating and Cultural Transmission into Account
Heritability estimates of general intelligence in adulthood generally range from 75 to 85%, with all heritability due to additive genetic influences, while genetic dominance and shared environmental factors are absent, or too small to be detected. These estimates are derived from studies based on the classical twin design and are based on the assumption of random mating. Yet, considerable positive assortative mating has been reported for general intelligence. Unmodeled assortative mating may lead to biased estimates of the relative magnitude of genetic and environmental factors.


Under the preferred phenotypic assortment model, the variance of intelligence in adulthood was not only due to non-shared environmental (18%) and additive genetic factors (44%) but also to non-additive genetic factors (27%) and phenotypic assortment (11%).This non-additive nature of genetic influences on intelligence needs to be accommodated in future GWAS studies for intelligence.
study  biodet  behavioral-gen  psychology  cog-psych  iq  twin-study  sib-study  biases  gotchas  models  map-territory  assortative-mating  variance-components  🌞  nonlinearity  regularizer  intricacy 
november 2017 by nhaliday
Two theories of home heat control - ScienceDirect
People routinely develop their own theories to explain the world around them. These theories can be useful even when they contradict conventional technical wisdom. Based on in-depth interviews about home heating and thermostat setting behavior, the present study presents two theories people use to understand and adjust their thermostats. The two theories are here called the feedback theory and the valve theory. The valve theory is inconsistent with engineering knowledge, but is estimated to be held by 25% to 50% of Americans. Predictions of each of the theories are compared with the operations normally performed in home heat control. This comparison suggests that the valve theory may be highly functional in normal day-to-day use. Further data is needed on the ways this theory guides behavior in natural environments.
study  hci  ux  hardware  embodied  engineering  dirty-hands  models  thinking  trivia  cocktail  map-territory  realness  neurons  psychology  cog-psych  social-psych  error  usa  poll  descriptive  temperature  protocol 
september 2017 by nhaliday
All models are wrong - Wikipedia
Box repeated the aphorism in a paper that was published in the proceedings of a 1978 statistics workshop.[2] The paper contains a section entitled "All models are wrong but some are useful". The section is copied below.

Now it would be very remarkable if any system existing in the real world could be exactly represented by any simple model. However, cunningly chosen parsimonious models often do provide remarkably useful approximations. For example, the law PV = RT relating pressure P, volume V and temperature T of an "ideal" gas via a constant R is not exactly true for any real gas, but it frequently provides a useful approximation and furthermore its structure is informative since it springs from a physical view of the behavior of gas molecules.

For such a model there is no need to ask the question "Is the model true?". If "truth" is to be the "whole truth" the answer must be "No". The only question of interest is "Is the model illuminating and useful?".
thinking  metabuch  metameta  map-territory  models  accuracy  wire-guided  truth  philosophy  stats  data-science  methodology  lens  wiki  reference  complex-systems  occam  parsimony  science  nibble  hi-order-bits  info-dynamics  the-trenches  meta:science  physics  fluid  thermo  stat-mech  applicability-prereqs  theory-practice 
august 2017 by nhaliday
Is the economy illegible? | askblog
In the model of the economy as a GDP factory, the most fundamental equation is the production function, Y = f(K,L).

This says that total output (Y) is determined by the total amount of capital (K) and the total amount of labor (L).

Let me stipulate that the economy is legible to the extent that this model can be applied usefully to explain economic developments. I want to point out that the economy, while never as legible as economists might have thought, is rapidly becoming less legible.
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august 2017 by nhaliday
Validation is a Galilean enterprise
We contend that Frey's analyses actually have little bearing on the external validity of the PGG. Evidence from recent experiments using modified versions of the PGG and stringent comprehension checks indicate that individual differences in people's tendencies to contribute to the public good are better explained by individual differences in participants' comprehension of the game's payoff structure than by individual differences in cooperativeness (Burton-Chellew, El Mouden, & West, 2016). For example, only free riders reliably understand right away that complete defection maximizes one's own payoff, regardless of how much other participants contribute. This difference in comprehension alone explains the so-called free riders' low PGG contributions. These recent results also provide a new interpretation of why conditional cooperators often contribute generously in early rounds, and then less in later rounds (Fischbacher et al., 2001). Fischbacher et al. (2001) attribute the relatively high contributions in the early rounds to cooperativeness and the subsequent decline in contributions to conditional cooperators' frustration with free riders. In reality, the decline in cooperation observed over the course of PGGs occurs because so-called conditional cooperators initially believe that their payoff-maximizing decision depends on whether others contribute, but eventually learn that contributing never benefits the contributor (Burton-Chellew, Nax, & West, 2015). Because contributions in the PGG do not actually reflect cooperativeness, there is no real-world cooperative setting to which inferences about contributions in the PGG can generalize.
study  behavioral-econ  economics  psychology  social-psych  coordination  cooperate-defect  piracy  altruism  bounded-cognition  error  lol  pdf  map-territory  GT-101  realness  free-riding  public-goodish  decision-making  microfoundations  descriptive  values  interests  generalization  measurement  checking 
june 2017 by nhaliday
The Limits of Public Choice Theory – Jacobite
Many people believe that politics is difficult because of incentives: voters vote for their self interest; bureaucrats deliberately don’t solve problems to enlarge their departments; and elected officials maximize votes for power and sell out to lobbyists. But this cynical view is mostly wrong—politics, insofar as it has problems, has problems not because people are selfish—it has problems because people have wrong ideas. In fact, people mostly act surprisingly altruistically, motivated by trying to do good for their country.


I got into politics and ideas as a libertarian. I was attracted by the idea of public choice as a universal theory of politics. It’s intuitively appealing, methodologically individualist, and it supported all of the things I already believed. And it’s definitely true to some extent—there is a huge amount of evidence that it affects things somewhat. But it’s terrible as a general theory of politics in the developed world. Our policies are bad because voters are ignorant and politicians believe in things too much, not because everyone is irredeemably cynical and atavistic.

interesting take, HBD?:

recommended by Garett Jones:
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may 2017 by nhaliday

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