David M. Kaplan
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View article: Regression and decomposition with ordinal health outcomes
Regression and decomposition with ordinal health outcomes Open
Although ordinal health outcome values are categories like "poor" health or "moderate" depression, they are often assigned values 1,2,3,… for convenience. We provide results on interpretation of subsequent analysis based on ordinary least …
View article: Confidence intervals for intentionally biased estimators
Confidence intervals for intentionally biased estimators Open
We propose and study three confidence intervals (CIs) centered at an estimator that is intentionally biased to reduce mean squared error. The first CI simply uses an unbiased estimator's standard error; compared to centering at the unbiase…
View article: Inference on Consensus Ranking of Distributions
Inference on Consensus Ranking of Distributions Open
Instead of testing for unanimous agreement, I propose learning how broad of a consensus favors one distribution over another (of earnings, productivity, asset returns, test scores, etc.). Specifically, given a sample from each of two distr…
View article: High-order Coverage of Smoothed Bayesian Bootstrap Intervals for Population Quantiles
High-order Coverage of Smoothed Bayesian Bootstrap Intervals for Population Quantiles Open
We characterize the high-order coverage accuracy of smoothed and unsmoothed Bayesian bootstrap confidence intervals for population quantiles. Although the original (Rubin 1981) unsmoothed intervals have the same O(n−1/2) coverage error as …
View article: Comparing latent inequality with ordinal data
Comparing latent inequality with ordinal data Open
Summary We propose new ways to compare two latent distributions when only ordinal data are available, and without imposing parametric assumptions on the underlying continuous distributions. First, we contribute identification results. We s…
View article: The impact of conventional versus robust norming on cognitive characterization and clinical classification of <scp>MCI</scp> and dementia
The impact of conventional versus robust norming on cognitive characterization and clinical classification of <span>MCI</span> and dementia Open
We examined the impact of conventional versus robust normative approaches on cognitive characterization and clinical classification of MCI versus dementia. The sample included participants from the National Alzheimer's Coordinating Center …
View article: Smoothed instrumental variables quantile regression
Smoothed instrumental variables quantile regression Open
In this article, I introduce the sivqr command, which estimates the coefficients of the instrumental variables quantile regression model introduced by Chernozhukov and Hansen (2005, Econometrica 73: 245–261). The sivqr command offers sever…
View article: Apixaban compared with warfarin to prevent thrombosis in thrombotic antiphospholipid syndrome: a randomized trial
Apixaban compared with warfarin to prevent thrombosis in thrombotic antiphospholipid syndrome: a randomized trial Open
Thrombotic antiphospholipid syndrome (TAPS) is characterized by venous, arterial, or microvascular thrombosis. Patients with TAPS merit indefinite anticoagulation, and warfarin has historically been the standard treatment. Apixaban is an o…
View article: Distcomp: Comparing distributions
Distcomp: Comparing distributions Open
The distcomp command is introduced and illustrated. The command assesses whether or not two distributions differ at each possible value while controlling the probability of any false positive, even in finite samples. Syntax and the underly…
View article: Understanding the Post COVID-19 Condition (Long COVID) and the Expected Burden for Ontario
Understanding the Post COVID-19 Condition (Long COVID) and the Expected Burden for Ontario Open
About Us: The Ontario COVID-19 Science Advisory Table is a group of scientific experts and health system leaders who evaluate and report on emerging evidence relevant to the COVID-19 pandemic, to inform Ontario's response.Our mandate is to…
View article: Ontario’s Community-Dwelling Older Adults Who Remain Unvaccinated Against COVID-19
Ontario’s Community-Dwelling Older Adults Who Remain Unvaccinated Against COVID-19 Open
About Us: The Ontario COVID-19 Science Advisory Table is a group of scientific experts and health system leaders who evaluate and report on emerging evidence relevant to the COVID-19 pandemic, to inform Ontario's response.Our mandate is to…
View article: Lessons Learned from Israel’s Vaccine Rollout
Lessons Learned from Israel’s Vaccine Rollout Open
As Ontario expands access to the COVID-19 vaccine beyond the Phase 1 priority populations, strategic planning and execution of mass vaccine rollout will have a significant impact on the health and safety of Ontario’s 14.5 million residents…
View article: Interpreting Unconditional Quantile Regression with Conditional Independence
Interpreting Unconditional Quantile Regression with Conditional Independence Open
This note provides additional interpretation for the counterfactual outcome distribution and corresponding unconditional quantile "effects" defined and estimated by Firpo, Fortin, and Lemieux (2009) and Chernozhukov, Fernández-Val, and Mel…
View article: Smoothed GMM for quantile models
Smoothed GMM for quantile models Open
This paper develops theory for feasible estimators of finite-dimensional parameters identified by general conditional quantile restrictions, under much weaker assumptions than previously seen in the literature. This includes instrumental v…
View article: Smoothed estimating equations for instrumental variables quantile regression
Smoothed estimating equations for instrumental variables quantile regression Open
The moment conditions or estimating equations for instrumental variables quantile regression involve the discontinuous indicator function. We instead use smoothed estimating equations (SEE), with bandwidth $h$. We show that the mean square…
View article: Bayesian and frequentist inequality tests
Bayesian and frequentist inequality tests Open
Bayesian and frequentist criteria are fundamentally different, but often posterior and sampling distributions are asymptotically equivalent (and normal). We compare Bayesian and frequentist hypothesis tests of inequality restrictions in su…
View article: Frequentist properties of Bayesian inequality tests
Frequentist properties of Bayesian inequality tests Open
Bayesian and frequentist criteria fundamentally differ, but often posterior and sampling distributions agree asymptotically (e.g., Gaussian with same covariance). For the corresponding single-draw experiment, we characterize the frequentis…
View article: Platelet-Monocyte Aggregates and C-Reactive Protein are Associated with VTE in Older Surgical Patients
Platelet-Monocyte Aggregates and C-Reactive Protein are Associated with VTE in Older Surgical Patients Open
Emerging evidence implicates platelets as key mediators of venous thromboembolism (VTE). Nevertheless, the pathways by which platelets and circulating procoagulant proteins synergistically orchestrate VTE remain incompletely understood. We…