We propose Hybrid Shrink (HS), a novel model for combining forecasts that merges forecast selection, weighting, and shrinkage concepts by shrinking forecasters’ weights to average weights, i.e., toward subset selection, or to zero. HS learns the forecast shrinkage direction by minimizing the...

Various forms of contact restriction have been adopted in response to the Covid-19 pandemic. Only recently, rapid testing appeared as a new policy instrument. If sufficiently effective, it may serve as a substitute for contact restrictions. Against this background we evaluate the effects of a...