Older, smarter, or both

[NEOWatcher]

Here's an interesting one:
Older Sibs May Not Necessarily Be Smarter


They blame a faulty previous study because they "tended to compare children from different families". Thier study instead was a "large nationwide sample."
Huh?

Anyway, how can you get any definitive answer anyway. The only way to do a direct comparison, is to test a younger sibling when the reach the age of the older sibling (a min of 9 mo). And then the conditions will be drastically different.
And if you take a sample of older and younger kids at the same time, then wouldn't the teaching methods for the younger kids be different then the older ones from when they were that same age?

I don't think there can be any conclusion from this.

[Gillianren]

My mother once told me that my IQ is higher than my older sister's. However, she's since denied even knowing my IQ, so who knows?

[Moose]

Gillian: You're here at BAUT, your sister is not. QED.

[Gillianren]

I'll go along with that.

[R.A.F.]

I don't think there can be any conclusion from this.

Certainly not in my case as I am an only child...