  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.
