«Underdispersion» in GLM (logit regression)

10 December 2012 1 6K Report

Quite often confronted with a “overdispersion” in the analysis of Poisson like data, and with this more - or less clear.

But conceive and give it physical explanation for «underdispersion»: Dev/rdf < 1 (eg, for binary data, not just corrections SE).

Someone may be rich in experience, references and examples?

Maria Chiara Rosace

If it can still help, I have recently found this interesting paper by Sellers and Morris (2017) which explains what causes underdispersion also reporting few examples: https://www.tandfonline.com/doi/pdf/10.1080/03610926.2017.1291976?casa_token=vaLg1NApTwIAAAAA:Aje8VhaXLFw4maJofE6APN0ALAnMuUGvr86Ws2dW8FsFyePAKDIz3abyS1NhV5_3DGpZht-ythlY

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