Search Results for author: Serena Ng

Found 8 papers, 2 papers with code

Imputation of Counterfactual Outcomes when the Errors are Predictable

no code implementations12 Mar 2024 Silvia Goncalves, Serena Ng

Often overlooked is the possibility that the out-of-sample error can be informative about the missing counterfactual outcome if it is mutually or serially correlated.

Causal Inference counterfactual +2

Constructing High Frequency Economic Indicators by Imputation

no code implementations3 Mar 2023 Serena Ng, Susannah Scanlan

This is also the case for a weekly version of the CFNAI index of economic activity that is imputed using seasonally unadjusted data.

counterfactual Imputation +2

Approximate Factor Models with Weaker Loadings

no code implementations8 Sep 2021 Jushan Bai, Serena Ng

Pervasive cross-section dependence is increasingly recognized as a characteristic of economic data and the approximate factor model provides a useful framework for analysis.

Factor-Based Imputation of Missing Values and Covariances in Panel Data of Large Dimensions

1 code implementation4 Mar 2021 Ercument Cahan, Jushan Bai, Serena Ng

Economists are blessed with a wealth of data for analysis, but more often than not, values in some entries of the data matrix are missing.

Imputation

Modeling Macroeconomic Variations After COVID-19

no code implementations3 Mar 2021 Serena Ng

Dynamic responses of variables to shocks in a VAR similar in magnitude and shape to the ones identified before 2020 can be recovered by directly or indirectly modeling covid and treating it as exogenous.

Time Series Time Series Analysis

Estimation and Inference by Stochastic Optimization: Three Examples

no code implementations20 Feb 2021 Jean-Jacques Forneron, Serena Ng

This paper illustrates two algorithms designed in Forneron & Ng (2020): the resampled Newton-Raphson (rNR) and resampled quasi-Newton (rqN) algorithms which speed-up estimation and bootstrap inference for structural models.

regression Stochastic Optimization

Least Squares Estimation Using Sketched Data with Heteroskedastic Errors

1 code implementation15 Jul 2020 Sokbae Lee, Serena Ng

The result arises because the sketched estimates in the case of random projections can be expressed as degenerate $U$-statistics, and under certain conditions, these statistics are asymptotically normal with homoskedastic variance.

regression

Matrix Completion, Counterfactuals, and Factor Analysis of Missing Data

no code implementations15 Oct 2019 Jushan Bai, Serena Ng

This paper proposes an imputation procedure that uses the factors estimated from a tall block along with the re-rotated loadings estimated from a wide block to impute missing values in a panel of data.

Imputation Matrix Completion

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