Field of Science

Having green in your flag is bad for your IQ

Important update 7/21-15: Please see comments below on the really low quality of the data. I was originally serious about this analysis taking the IQ data at face value, but now want to state that while I do find the aspect of the flag colors amusing, I totally do not trust the IQ data.

If your country has green in its flag, then you are less likely to be intelligent.

If that isn't an explosive statement, then I don't know what is. But data from Raven-online suggest that this is true.

In this figure is 183 countries ranked by average IQ from left to right. The higher average IQ the further to the right they are plotted. Countries that have green in their flags have a green spot, and all other have a red spot:

The average IQ of countries with green flags is 79.2 (stdev=9.5) and of countries no no green it is 89.0 (stdev=10.1), and this difference is statistically significant (a 2-sample t-test gives p=2.29e-10). You can download the annotated data here.

Supposedly Raven's test-results are pretty good:
It has been demonstrated that there is a 70% correlation between the results of this test and educational achievement. Consequently, the higher your result in this test the greater your chances of success at higher levels of study. By comparison, the correlation factors in other IQ tests have an average variation of between 20 and 60%.
70% is a very strong correlation, and they are probably right to point out that the strong correlation between IQ and level of education is not spurious. And yet, I think they got causality the wrong way around.

They are implying that if you have high IQ, then you have a higher the chance that you can successfully attain a higher educational degree. But look at the top ranked countries: Italy has some green in their flag and an average IQ score of 102. The countries ranked higher than Italy are Hong Kong, Singapore, South Korea, Japan, and Taiwan - all affluent Asian nations that emphasize book-studies from a very young age. Many, if not all, of these countries make middle-schoolers take tests, and these tests matter for their future. They are, in other words, trained to take tests. Their school systems are good at making students do well on tests. Compare that to poor counties like Djibouti, Lesotho, Gabon, and Equatorial Guinea, who all have green in their flags. They are poor countries, which obviously negatively affects education, which then doesn't allow children to practice taking tests very much (which I am not particularly in favor of anyway, I have to say).

You can practice taking tests, and it will affect your score. If that wasn't true, then there would be no point in practicing taking tests, which is something teachers everywhere make their students do.

So rather than IQ affecting education, I posit that it is education that affects IQ. That doesn't sound nearly as sexy (nor is it novel), and Raven is in business of selling IQ tests. They would like IQ to say something about your chances in life, whereas the truth is more likely that the more chances you
have in life, the higher your IQ is likely to be.

The really interesting question here is what causes the correlation between average national IQ and having green in the flag. You could very well argue that it's completely spurious: just because there isa correlation does not necessitate that there is any causation. It is difficult to argue against such a proposition - there exists lots of very intriguing but probably completely random correlations, such as yearly deaths by drowning in a pool vs. the number of movies Nicholas Cage has appeared in. However, those strange and unexplainable correlations are found by cherry-picking many, many more random pairs of variables. The correlation between IQ and green in flag is a one-shot observation, which makes it stand out. The task is then to come up with plausible explanations for the relationship.

Start by noting that there is a positive correlation between national income, education, and average IQ. It makes sense. We then observe that having green in the flag increases IQ: "smarter people dislike green". Maybe there is an effect of having green in the flag on national income: "green makes people lazy" or "other counties prefer not to trade with 'green' countries":

Other variables could be introduced. It seems to me that the "green" countries are for the most part warmer countries, particularly African. The closer countries are to the equator (lower latitude), the worse the average IQ is. Perhaps something about the latitude causes lower national income (Jared Diamond argue that coincidental geography is the main factor in explaining differences in national wealth among countries) and a preference for green? How about this: "people who live in environments where plants are green all year round are more likely to make their flags contain some green". It could be some other psychological preference that is shaped by living at a lower latitude.

I am stumped. Maybe some historian would have something to say about the prevalence of green flags at lower latitudes?

Here's more from Raven's website (original emphasis):
Richard and Tatu argues that differences in national income are correlated with differences in the average national intelligence quotient (IQ). They further argue that differences in average national IQs constitute one important factor, but not the only one, contributing to differences in national wealth and rates of economic growth.

These results are controversial and have caused much debate, they must be interpreted with extreme caution.

Sources: IQ and the Wealth of Nations (2006), IQ and Global Inequality (2002)
I ask again: do differences in average national IQ scores contribute to national wealth and economic growth, or is is more likely that national wealth contribute to raising the national average IQ? I'd say the latter, contrary to Richard and Tatu.

However, there's probably little doubt that having an educated population does contributes to the national wealth, so causality is likely circular: wealth  education  wealth, with higher average IQ (i.e., test-taking abilities) as a side-effect.


  1. From reddit user Hiruto:

    You throw up some interesting questions. Some possible explanations for green flags and low IQ off the top of my head:
    My impression is that green is a common colour of Islamic country flags. I'm not implying Muslims are inherently less intelligent: there have been periods in history when Islamic countries were some of the most scientifically advanced in the world. Perhaps current Islamic economies have some institutional disadvantage that causes less effective education and/or lower national income and hence lower IQ test scores.
    Another possible explanation is that European countries have a preference for primary colours, notably red and blue as well as white. Historically these were the cheapest dyes to make that were easily distinguishable on the battlefield. Perhaps in sunnier locations primary colours aren't needed for visibility, or the larger scale of European warfare made recognisability more important. The economic power of European countries and their colonies would then explain the IQ difference through education.
    Super heroes also often have primary colours in their costumes. Whether this is influenced by national flag colours, or there is some underlying cultural preference that explains both, I would not know.

    1. Green flags generally signal poor economy and low education, comparatively speaking.

  2. Gotta share this paragraph from Wikipedia (link above) criticizing the book that the data is from (IQ and the wealth of Nations):

    "Some criticisms have focused on the limited number of studies upon which the book is based. The IQ figure is based on one study in 34 nations, and two studies in 30 nations. There were actual tests for IQ in 81 nations. For 104 nations there were no IQ studies at all and IQ was estimated based on IQ in surrounding nations.[2] The limited number of participants in some studies has also been criticized. A test of 108 9- to 15-year-olds in Barbados, of 50 13- to 16-year-olds in Colombia, of 104 5- to 17-year-olds in Ecuador, of 129 6- to 12-year-olds in Egypt, and of 48 10- to 14-year-olds in Equatorial Guinea, all were taken as measures of national IQ.[3]"

    That is fucking egregious. Interpolating between countries to make up data, and basing national IQ scores on very limited samples of children only. WTF!

  3. Completely agree with the skepticism regarding the dataset - and I wrote a dissertation on IQ testing in US and Mexico. Regarding the green flags - my first thought was that flags are supposed to represent something and that maybe those with green it is intended to represent agriculture, so the more agrarian countries have green flags and also tend to be less developed, hence more poverty contributes to lower IQ. That is just a wild guess, though.

  4. Your IQ score ofis a measure of your intelligence. The higher the IQ the better. Your IQ is usually measured over a general IQ scale range and the standard IQ range is as follows


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