Combining forecasts – forty years later

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The Good Judgment Project: A Large Scale Test of Different Methods of Combining Expert Predictions (2012, background): “Although combining multiple forecasts has long been studied [Wallsten et al. 1997; Wallis 2011], there are still many open questions on how to best make use of multiple people when estimating the probability of an event.”
The Evolution of Forecast Density Combinations in Economics (2018, methodology): “Amisano and Geweke (2010) and Mitchell and Wallis (2011) discuss apparent similarities between the combined forecast density - represented in (2) via the linear opinion pool - and model “mixtures”.”
Energy Forecasting: A Review and Outlook (2020, background): “Some notable reviews can be found in [33]–[35].”
Quantile aggregation of density forecasts (2014, unknown): “Some examples are Wallis (2005, 2011), Hall and Mitchell (2007), Mitchell and Wallis (2010), Geweke and Amisano (2011), Fawcett et al. (2013).”
Electricity price forecasting: A review of the state-of-the-art with a look into the future (2014, background): “As the literature on combining forecasts ‘‘is now voluminous and rather repetitive’’ (Wallis, 2011), we do not attempt to review all or even most methods.”