Research

My methodological work centers on marginal modeling approaches — particularly penalized GEE and QIF — for spatially correlated repeated-measures data with excess zeros. Substantively, I apply these methods to characterize the built food environment near schools and examine socioeconomic patterning of health-relevant exposures across geographic scales.

I have served as lead biostatistician on 5+ NIH-funded longitudinal health and RWE studies, managing large-scale relational datasets integrating EHR, geospatial, retail environment, and longitudinal cohort data. I apply causal inference methods (PSM, IPW, RDD, IV), latent class and transition models, Bayesian hierarchical models, and survival analysis — and develop R packages and R Shiny dashboards for non-technical stakeholders.

Current Position

Doctoral Research Fellow & Lead Biostatistician
Biostatistics for Social Impact Lab, Drexel University  ·  2022–Present

Research Interests

Penalized GEE & Fusion Learning Quadratic Inference Functions (QIF) Zero-Inflated Count Models Longitudinal & Repeated-Measures Data Spatial Epidemiology Built Food Environment Health Equity & Disparities Latent Class & Transition Models Clinical Trials Methodology Causal Inference Real-World Evidence (RWE) Survival Analysis Synthetic Data Generation Medical Device Study Design

Technical Skills

Statistical Software

R (expert: packages, Shiny, ggplot2, plotly), SAS (proficient), Python (proficient), SQL, Stata, MPlus, WinBUGS; Git/GitHub

Data & Reproducibility

REDCap (administrator), relational databases, EHR/claims workflows, reproducible analytical pipelines (RAP), Quarto, LaTeX

Visualization & Reporting

ggplot2, plotly, Tableau, R Shiny dashboards; Statistical Analysis Plans (SAPs); publication-quality figures

Methods & Modeling

PSM, IPW, IV, RDD; latent class/transition models; Bayesian hierarchical modeling; synthetic data (Gaussian copula, GANs, VAEs); ICH E9/E9(R1)

NIH-Funded Projects

NIH R01MD017687
Effectiveness of population-level interventions in schools and academic performance
PI: B.N. Sánchez  ·  Drexel University
NIH R01HL131610
Characterizing health impacts of built environment features using complex data
PI: B.N. Sánchez  ·  Drexel University
NIH R01HL136718
Characterizing food environments near schools in California
PI: B.N. Sánchez  ·  Drexel University
NIH R01HD111169
Population-level nutrition interventions and food environment effects on obesity
PI: B.N. Sánchez  ·  Drexel University

Additional collaborations: MESA Study (latent transition analysis, retail environment & HbA1c)  ·  All of Us Research Program (school racial diversity; Hispanic adult obesity)