Thank you for your interest in the matter.
1) I think even in your example model, the answer chosen by the method would still be C, the correct conclusion, for, as the author says, "The percentage of smart and dull groups choosing each answer is compared and the largest ratio of the smart to dull percentages is the Smart Vote."(emphasis added) As you see, it's not the difference (a subtraction) that matters, but the ratio: A = 50/70 ~ 0.71 B = 40/27 ~ 1.6 C = 10/3 ~ 3.3 Thus, C > B > A.
2) and 3) I don't grok totally Regression Analysis yet (dropped out College, akrasia+depression won), but he emphasises in many comments that he controls for many variables such as income, education, to avoid non-cognitive motivations (I'm not sure this is the right term, but I hope you understand me) and only get the 'smart' decisions.
Regarding biases, he once gave an answer to User:gwern who once commented on his blog, that even though it is true that even bright people are prone to some biases as everyone else, still in these cases they're a little bit less prone, so what counts is the 'trend' from the dumb to the smart. In his words:
"In cases like the sunk cost fallacy high IQ people usually make mistakes like everyone else. The point however is that on average they make them less often. Typically you see stuff like 70% of a smart group get it wrong but 90% of the dull group do. That trend, and not the % correct, is what points to the better answer.
I have a big collection of common logical mistakes people make (gleaned from Tversky & Kahneman mostly, but also many others). On all those I've tried so far - including the sunk cost fallacy - the brighter group does quite a bit better, even though most still get them wrong. Contrary to what you are saying here the Smart Vote does particularly well on such fallacies."
Regarding the question posed in the EDIT, he seems to use the General Social Survey (GSS). According to Wikipedia ,
"The General Social Survey (GSS) is a sociological survey used to collect data on demographic characteristics and attitudes of residents of the United States. The survey is conducted face-to-face with an in-person interview by the National Opinion Research Center at the University of Chicago, of a randomly-selected sample of adults (18+) who are not institutionalized. The survey was conducted every year from 1972 to 1994 (except in 1979, 1981, and 1992). Since 1994, it has been conducted every other year. The survey takes about 90 minutes to administer. As of 2010 28 national samples with 55,087 respondents and 5,417 variables had been collected. The data collected about this survey includes both demographic information and respondent's opinions on matters ranging from government spending to the state of race relations to the existence and nature of God. Because of the wide range of topics covered, and the comprehensive gathering of demographic information, survey results allow social scientists to correlate demographic factors like age, race, gender, and urban/rural upbringing with beliefs, and thereby determine whether, for example, an average middle-aged black male respondent would be more or less likely to move to a different U.S. state for economic reasons than a similarly situated white female respondent; or whether a highly educated person with a rural upbringing is more likely to believe in a transcendent God than a person with an urban upbringing and only a high-school education."
So, yes, I think it's a fairly comprehensive and diverse sample.
Thanks, this seems fair.
Is there an example of "politically correct" beliefs? Such as "everything is learned, heredity is a myth". I would suspect intelligent people more prone to this kind of beliefs, because they are associated with education and they require more complex explanation -- both is opportunity to signal intelligence.
I would like to point you guys to the blog FreakoStats, by Garth Zietsman, who according to his profile, "Scored an IQ of 185 on the Mega27 and has a degree in psychology and statistics and 25 years experience in psychometrics and statistics." The main concept discussed there is "The Smart Vote", whose essence, in the author’s words, is as follows:
Many of his posts are based on the choice of relevant, if controversial, topics , and his analysis of the direction and the proportionality of which an opinion on it is related to intelligence, as measured by IQ scores.
An obvious objection would be that smart people would have in many cases common interests, and this could bias the results simply to their interests, in detriment to the interests of the less smart.
Zietsman answers it with the statistical fact that people many times don’t vote selfishly, and that he can (and will) control for some of their interests anyway:
This seems somewhat related to the notorious concept of Coherent Extrapolation Volition (CEV) of humankind. To have a clue of the direction it might take, I believe it is a nice idea to look at the opinion of the smarter (“if we knew more, thought faster, […]”), corrected for selfish interests (“[…]were more the people we wished we were, had grown up farther together[…]”), specially bearing in mind that most results tend to converge (“[…]where our wishes cohere rather than interfere; extrapolated as we wish that extrapolated[…]”).
There are analyses on issues such as Abortion, Free Speech ,Capital Punishment and Corporal Punishments on Children ,Immigration, Gay Rights and many more. The results look good to me personally, and I wouldn't be surprised if they pleased many here too.