We know that dumb people tend to have larger families, so I was curious about how much IQ drops with each additional child. Here's the mean IQ by family size (sample size = 26,388, immigrants excluded):
Mean offspring IQ by number of children
If we do an OLS regression, we see that for each additional child, the predicted drop in IQ is 1.13 points. This doesn't mean, of course, that having more kids causes IQs to fall. It simply means that the dumber the couple, the bigger the number of children. As shown in the movie "Idiocracy," smart people see every reason to delay having kids, while the dull ones do what comes naturally.
Some researchers have claimed that the average IQ of the Irish used to be really low by West European standards but has recently caught up, ...
More on trust: As a follow-up to the last post, I wondered about the level of trust in Asian and Muslim countries. Based on World Values Sur...
The plot thickens: As a follow-up to the last post, I wanted to see if the risk of arrest varies by hair color. I found that people with red...
Which factor reduces family size the most? Below are the standardized OLS regression coefficients for a sample of whites ages 40-59: Stand...