I'm interested in marriage/divorce information by birth date.
Does anyone know the best place to get something like that?
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Something like this?
You can find the spreadsheet on the bottom of the page.
There's are a number of studies on various 'birthday effects' in economics literature. I don't know of any that use open data, but you could contact the authors for help in your research.
Here's an example from the genre. http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2241677