Works Published in 2009

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Displaying all 13 works

Sorted by most recent date added to the index first, which may not be the same as publication date order.

2009 journal article

Evaluating emergency medical service performance measures

Health Care Management Science, 13(2), 124–136.

author keywords: Discrete optimization; Emergency medical service; Patient outcomes; Performance measures; Health policy modeling
MeSH headings : Algorithms; Emergency Medical Services / organization & administration; Emergency Medical Services / standards; Evaluation Studies as Topic; Health Policy; Outcome Assessment, Health Care; Quality Indicators, Health Care; Virginia
TL;DR: The results indicate that locating ambulances to maximize seven and eight min response time thresholds simultaneously maximize patient survival, which results in more equitable patient outcomes, with improved patient survival rates in rural regions. (via Semantic Scholar)
Sources: Crossref, ORCID
Added: January 21, 2021

2009 chapter

Incorporating Environmental Concerns in Supply Chain Optimization

In Environmentally Conscious Materials Handling (pp. 117–135).

By: M. Mayorga* & R. Subramanian*

Sources: Crossref, ORCID
Added: August 28, 2020

2009 journal article

Allocating flexible servers in serial systems with switching costs

Annals of Operations Research, 172(1), 231–242.

By: M. Mayorga*, K. Taaffe* & R. Arumugam*

TL;DR: It is shown that a simpler policy which only moves one server can achieve close to optimal results in the two-station two-server case, and proposed three alternate heuristic policies are proposed. (via Semantic Scholar)
Sources: Crossref, ORCID
Added: August 28, 2020

2009 chapter

An Inverse Problem Statistical Methodology Summary

In Mathematical and Statistical Estimation Approaches in Epidemiology (pp. 249–302).

By: H. Banks n, M. Davidian n, J. Samuels n & K. Sutton n

Sources: Crossref, ORCID
Added: January 23, 2020

2009 journal article

On asymptotically optimal tests under loss of identifiability in semiparametric models

The Annals of Statistics, 37(5A), 2409–2444.

By: R. Song*, M. Kosorok & J. Fine

author keywords: Change-point models; contiguous alternative; empirical processes; exponential average test; nonstandard testing problem; odds-rate models; optimal test; power; profile likelihood
TL;DR: Exponential average tests based on integrated profile likelihood are constructed and shown to be asymptotically optimal under a weighted average power criterion with respect to a prior on the nonidentifiable aspect of the model. (via Semantic Scholar)
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions (OpenAlex)
Sources: Crossref, ORCID
Added: January 20, 2020

2009 journal article

A note on semiparametric efficient inference for two-stage outcome-dependent sampling with a continuous outcome

Biometrika, 96(1), 221–228.

By: R. Song*, H. Zhou & M. Kosorok

author keywords: Biased sampling; Empirical process; Maximum likelihood estimation; Missing data; Outcome-dependent; Profile likelihood; Two-stage sampling
TL;DR: It is shown that a certain semiparametric maximum likelihood estimator is computationally convenient and achieves the semiprametric efficient information bound. (via Semantic Scholar)
Sources: Crossref, ORCID
Added: January 20, 2020

2009 journal article

Cardiac Resynchronization Therapy Reduces the Risk of Hospitalizations in Patients With Advanced Heart Failure

Circulation, 119(7), 969–977.

By: I. Anand*, P. Carson*, E. Galle*, R. Song*, J. Boehmer*, J. Ghali*, B. Jaski*, J. Lindenfeld* ...

author keywords: cardiac resynchronization therapy; defibrillators, implantable; heart failure; hospitalizations; prognosis
MeSH headings : Adult; Aged; Cardiac Pacing, Artificial; Defibrillators, Implantable; Female; Heart Failure / therapy; Hospitalization / statistics & numerical data; Humans; Male; Middle Aged
TL;DR: Use of CRT with or without a defibrillator in advanced heart failure patients was associated with marked reductions in all-cause, cardiac, and heart failure hospitalization rates in an analysis that accounted for the competing risk of mortality and unequal follow-up time. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Crossref, ORCID
Added: January 20, 2020

2009 journal article

Joint covariate-adjusted score test statistics for recurrent events and a terminal event

Lifetime Data Analysis, 16(4), 491–508.

By: R. Song* & J. Cai*

author keywords: Frailty; Proportional hazards; Proportional rates; Recurrent events data; Semiparametric model
MeSH headings : Angiotensin-Converting Enzyme Inhibitors / therapeutic use; Computer Simulation; Data Interpretation, Statistical; Enalapril / therapeutic use; Heart Failure / drug therapy; Hospitalization; Humans; Models, Statistical; Recurrence; Treatment Outcome
TL;DR: Joint covariate-adjusted score test statistics based on joint models of recurrent events and a terminal event are proposed to improve the efficiency over tests based on covariate unadjusted model. (via Semantic Scholar)
Sources: Crossref, ORCID
Added: January 20, 2020

2009 journal article

Nonlinear Models for Longitudinal Data

AMERICAN STATISTICIAN, 63(4), 378–388.

By: J. Serroyen*, G. Molenberghs*, G. Verbeke* & M. Davidian*

author keywords: Conditional model; Marginal model; Random-effects model; Serial correlation; Transition model
TL;DR: All three main modeling families, marginal models, random-effects models, and conditional models are considered, exemplify their great flexibility and relative ease of use, and apply them to a simple but illustrative set of data on tree circumference growth of orange trees. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2009 journal article

Latent-Model Robustness in Joint Models for a Primary Endpoint and a Longitudinal Process

BIOMETRICS, 65(3), 719–727.

By: X. Huang*, L. Stefanski n & M. Davidian n

author keywords: Censoring; Random effect; Remeasurement method; SIMEX
MeSH headings : Biometry / methods; Clinical Trials as Topic; Computer Simulation; Data Interpretation, Statistical; Effect Modifier, Epidemiologic; Endpoint Determination / methods; Longitudinal Studies; Models, Statistical; Regression Analysis
TL;DR: Methods to diagnose random effect model misspecification of the type that leads to biased inference on joint models are presented and illustrated via application to simulated data. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2009 journal article

Improving efficiency and robustness of the doubly robust estimator for a population mean with incomplete data

BIOMETRIKA, 96(3), 723–734.

By: W. Cao n, A. Tsiatis n & M. Davidian n

author keywords: Causal inference; Enhanced propensity score model; Missing at random; No unmeasured confounders; Outcome regression
TL;DR: This work proposes alternative doubly robust estimators that achieve comparable or improved performance relative to existing methods, even with some estimated propensity scores close to zero. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2009 journal article

Gene-Trait Similarity Regression for Multimarker-Based Association Analysis

Biometrics, 65(3), 822–832.

By: J. Tzeng n, D. Zhang n, S. Chang*, D. Thomas* & M. Davidian n

MeSH headings : Chromosome Mapping / methods; Computer Simulation; Genetic Linkage / genetics; Genetic Markers / genetics; Haplotypes / genetics; Humans; Models, Genetic; Models, Statistical; Quantitative Trait Loci / genetics; Regression Analysis
TL;DR: The proposed similarity‐based regression method to detect associations between traits and multimarker genotypes allows for covariates, uses phase‐independent similarity measures to bypass the needs to impute phase information, and is applicable to traits of general types. (via Semantic Scholar)
Sources: NC State University Libraries, ORCID, Crossref
Added: August 6, 2018

2009 journal article

A model for HCMV infection in immunosuppressed patients

MATHEMATICAL AND COMPUTER MODELLING, 49(7-8), 1653–1663.

By: G. Kepler*, H. Banksa, M. Davidian* & E. Rosenberg*

author keywords: HCMV; CMV; Herpes; Transplantation; Mathematical model; Immunosuppression
TL;DR: Simulations with the approximated parameter values demonstrates that the model is capable of describing primary, latent, and secondary (reactivated) HCMV infection. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018

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