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Program Evaluation and Causal Inference With High-Dimensional Data

Econometrica 2017 85(1), 233-298 open access
The accepted manuscript version (last revised 5 Jan 2018 (v8)) has 118 pages, 3 tables, 11 figures, and includes supplementary appendix. This version corrects some typos in Example 2 of the published version. This supplement contains 11 appendices with additional results and some omitted proofs. Appendices F-J include additional results for Sections 2-7, respectively. Appendix K gathers auxiliary results on algebra of covering entropies. Appendices L and M contain the proofs of Sections 4 and 5 omitted from the main text. Appendix N contains the proofs of Sections 6 omitted from the main text, together with the proofs of the additional results for Section 6 in Appendix I. Appendix O reports the results of a simulation experiment.

Misspecified Recovery

Journal of Finance 2016 71(6), 2493-2544
ABSTRACT Asset prices contain information about the probability distribution of future states and the stochastic discounting of those states as used by investors. To better understand the challenge in distinguishing investors' beliefs from risk‐adjusted discounting, we use Perron–Frobenius Theory to isolate a positive martingale component of the stochastic discount factor process. This component recovers a probability measure that absorbs long‐term risk adjustments. When the martingale is not degenerate, surmising that this recovered probability captures investors' beliefs distorts inference about risk‐return tradeoffs. Stochastic discount factors in many structural models of asset prices have empirically relevant martingale components.

Consumption Strikes Back? Measuring Long‐Run Risk

Journal of Political Economy 2008 116(2), 260-302
We characterize and measure a long-term risk-return trade-off for the valuation of cash flows exposed to fluctuations in macroeconomic growth. This trade-off features risk prices of cash flows that are realized far into the future but continue to be reflected in asset values. We apply this analysis to claims on aggregate cash flows and to cash flows from value and growth portfolios by imputing values to the long-run dynamic responses of cash flows to macroeconomic shocks. We explore the sensitivity of our results to features of the economic valuation model and of the model cash flow dynamics. (c) 2008 by The University of Chicago. All rights reserved.

Designing Realized Kernels to Measure the ex post Variation of Equity Prices in the Presence of Noise

Econometrica 2008 76(6), 1481-1536
This paper shows how to use realized kernels to carry out efficient feasible inference on the ex post variation of underlying equity prices in the presence of simple models of market frictions. The weights can be chosen to achieve the best possible rate of convergence and to have an asymptotic variance which equals that of the maximum likelihood estimator in the parametric version of this problem. Realized kernels can also be selected to (i) be analyzed using endogenously spaced data such as that in data bases on transactions, (ii) allow for market frictions which are endogenous, and (iii) allow for temporally dependent noise. The finite sample performance of our estimators is studied using simulation, while empirical work illustrates their use in practice. Copyright 2008 The Econometric Society.

The Effects of Critical Audit Matter Paragraphs and Accounting Standard Precision on Auditor Liability

The Accounting Review 2016 91(6), 1629-1646
ABSTRACT The Public Company Accounting Oversight Board recently proposed amendments to the standard audit report that would require the disclosure of critical audit matters (CAMs), and the Securities and Exchange Commission continues to evaluate the use of principles-based (imprecise) accounting standards within U.S. generally accepted accounting principles. We assert that jurors perceive precise accounting standards to constrain auditors' control over financial reporting outcomes, resulting in a lower propensity for negligence verdicts when the accounting treatment conforms to the precise standard. However, we hypothesize that the use of either imprecise standards or CAMs reduces the extent to which jurors perceive this constraint to exist, leading to increased auditor liability. We present experimental evidence supporting this argument. Our results highlight the similarities between the effects of imprecise accounting standards and CAMs on negligence assessments. These results provide insight for regulators and the auditing profession about the potential consequences of the proposed regulatory changes.

Post-Selection and Post-Regularization Inference in Linear Models with Many Controls and Instruments

American Economic Review 2015 105(5), 486-490 open access
We consider estimation of and inference about coefficients on endogenous variables in a linear instrumental variables model where the number of instruments and exogenous control variables are each allowed to be larger than the sample size. We work within an approximately sparse framework that maintains that the signal available in the instruments and control variables may be effectively captured by a small number of the available variables. We provide a LASSO-based method for this setting which provides uniformly valid inference about the coefficients on endogenous variables. We illustrate the method through an application to demand estimation.

The missing links: A global study on uncovering financial network structures from partial data

Journal of Financial Stability 2018 35, 107-119 open access
Capturing financial network linkages and contagion in stress test models are important goals for banking supervisors and central banks responsible for micro- and macroprudential policy. However, granular data on financial networks is often lacking, and instead the networks must be reconstructed from partial data. In this paper, we conduct a horse race of network reconstruction methods using network data obtained from 25 different markets spanning 13 jurisdictions. Our contribution is two-fold: first, we collate and analyze data on a wide range of financial networks. And second, we rank the methods in terms of their ability to reconstruct the structures of links and exposures in networks.

Double/Debiased/Neyman Machine Learning of Treatment Effects

American Economic Review 2017 107(5), 261-265 open access
Chernozhukov et al. (2016) provide a generic double/de-biased machine learning (ML) approach for obtaining valid inferential statements about focal parameters, using Neyman-orthogonal scores and cross-fitting, in settings where nuisance parameters are estimated using ML methods. In this note, we illustrate the application of this method in the context of estimating average treatment effects and average treatment effects on the treated using observational data.