Rapach, David E.; Strauss, Jack K.; Zhou, Guofu - In: Review of Financial Studies 23 (2010) 2, pp. 821-862
Welch and Goyal (2008) find that numerous economic variables with in-sample predictive ability for the equity premium fail to deliver consistent out-of-sample forecasting gains relative to the historical average. Arguing that model uncertainty and instability seriously impair the forecasting...