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We study the properties of generalized stochastic gradient (GSG) learning in forward-looking models. We examine how the conditions for stability of standard stochastic gradient (SG) learning both differ from and are related to E-stability, which governs stability under least squares learning. SG...
Persistent link: https://www.econbiz.de/10012466981
done better over the same period. This theory makes several distinctive predictions, which, for concreteness, we develop in … a stock-market setting. For example, starting with symmetric and homoskedastic fundamentals, the theory yields …
Persistent link: https://www.econbiz.de/10012468685
We have seen in the past decade a sharp increase in the extent that companies use data to optimize their businesses. Variously called the `Big Data' or `Data Science' revolution, this has been characterized by massive amounts of data, including unstructured and nontraditional data like text and...
Persistent link: https://www.econbiz.de/10012453413
We study the design of optimal monetary policy under uncertainty in a dynamic stochastic general equilibrium models. We … use a Markov jump-linear-quadratic (MJLQ) approach to study policy design, approximating the uncertainty by different … a benchmark New Keynesian model, analyzing how policy is affected by uncertainty, and how learning and active …
Persistent link: https://www.econbiz.de/10012464755
choice theory under uncertainty to explore the ramifications of model uncertainty and learning in environments in which … decision theory to characterize when learning or discriminating among competing probability models is challenging. I also use …
Persistent link: https://www.econbiz.de/10012465708
Despite the clear success of forecast combination in many economic environments, several important issues remain incompletely resolved. The issues relate to selection of the set of forecasts to combine, and whether some form of additional regularization (e.g., shrinkage) is desirable. Against...
Persistent link: https://www.econbiz.de/10012480620
-looking models; time-varying central-bank judgment about the state of model uncertainty; and so forth. We provide an algorithm for … uncertainty, so-called Markov jump-linear-quadratic systems extended to include forward-looking variables. The form of model … uncertainty our framework encompasses includes: simple i.i.d. model deviations; serially correlated model deviations; estimable …
Persistent link: https://www.econbiz.de/10012466939
We introduce a new, hybrid measure of stock return tail covariance risk, motivated by the under-diversified portfolio holdings of individual investors, and investigate its cross-sectional predictive power. Our key innovation is that this covariance is measured across the left tail states of the...
Persistent link: https://www.econbiz.de/10012459202
Long-run forecasts of economic variables play an important role in policy, planning, and portfolio decisions. We consider long-horizon forecasts of average growth of a scalar variable, assuming that first differences are second-order stationary. The main contribution is the construction of...
Persistent link: https://www.econbiz.de/10012459791
Forecasts of professional forecasters are anomalous: they are biased, forecast errors are autocorrelated, and forecast revisions predict forecast errors. Sticky or noisy information models seem like unlikely explanations for these anomalies: professional forecasters pay attention constantly and...
Persistent link: https://www.econbiz.de/10012696404