Liam's post below points to differing patterns in the seasonality of birth by family background. Using PISA 2000, I plot month of birth according to the data's measure of SES - using a median split.There does appear to be differences although they don't look dramatic to me. Around Autumn/Fall they seem fairly similar and this is usually when the cut-off dates for school entry are.
Interesting graph Kevin. Though, as you know, it is hard to just use an eyeball to work this out as the results in these papers are generally using large-sample type results and relying on fairly fine differences - this is one of the critiques.
ReplyDeleteYes, I'm sure the differences are "statistically significant" but then n=160,000 I think. But if you want to know whether the differences are significant in a more meaningful way, eyeballing is not bad.
ReplyDeletenot using this data, but any big non-US datasets to hand to graph years of schooling by month of birth?
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