(This article was originally published at Statistical Modeling, Causal Inference, and Social Science, and syndicated at StatsBlogs.)

A friend with a baby who was born a couple weeks late commented that he would’ve liked a website that gave an estimated due date that was something more accurate than the usual “last menstrual period + 40 weeks.” I did a quick google and found this and this. Based on their descriptions of what information they use, the first site looks like it might be good, and the second site looks iffy. But I don’t really know.
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