How birth order and IQ

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According to recent information, there is a small but reliable negative correlation between IQ and birth order. This is that the more older siblings one has, the lower the person's IQ is. This result came after many speculations of the finding; before, there was little evidence that birth rate and personality coincided. There is a major flaw in research because the size of the family plays a large role. According to Joshua Hartshorne, "A child from a two-kid family has a 50 percent chance of being a firstborn, whereas a child from a five-kid family has only a 20 percent chance of being a firstborn." Therefore, if you are part of a smaller family, it is much more likely that you will be a first born than if you were part of a larger family.
The first born tending to be more intelligent could be linked to many factors. The major reason is that larger families have to distribute their resources more thinly (time, money, etc). Also, well educated and wealthy parents tend to have fewer children, while less educated and economically unstable families tend to have more children.
Even though new evidence supports these claims, there is still not a strong correlation between intelligence and birth order, so the evidence, to me, seems unreliable.
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Be a little clearer in showing the problem with the size of family. Why is it a problem? Add pictures.

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This page contains a single entry by dingm052 published on November 19, 2011 5:00 PM.

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