An extended note on the multibin logarithmic score used in the FluSight competitions

preprint2019arXivOpen access

Abstract

In recent years the Centers for Disease Control and Prevention (CDC) have organized FluSight influenza forecasting competitions. To evaluate the participants' forecasts a multibin logarithmic score has been created, which is a non-standard variant of the established logarithmic score. Unlike the original log score, the multibin version is not proper and may thus encourage dishonest forecasting. We explore the practical consequences this may have, using forecasts from the 2016/17 FluSight competition for illustration.

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