We develop regression-based tests of hypotheses about out of sample prediction errors. Representative tests include ones for zero mean and zero correlation between a prediction error and a vector of predictors. The relevant environments are ones in which predictions depend on estimated...

This paper evaluates potential explanations for the sometimes poor forecasting performance of the Phillips curve. One explanation is that out-of-sample metrics are noisy or, equivalently, have relatively low power. Another potential explanation is instability in the coefficients of the model. To...

We develop methods for testing whether, in a finite sample, forecasts from nested models are equally accurate. Most prior work has focused on a null of equal accuracy in population — basically, whether the additional coefficients of the larger model are zero. Our asymptotic approximation...