ihmeuw/vivarium_research
Oct 2024 – Oct 2025
9 Months active
Languages Used
RSTSVGrstPythonYAMLreStructuredText
Technical Skills
DocumentationTechnical WritingCI/CDDiagrammingGitHub ActionsMathematical Modeling
Nathaniel Blair-Stahn
PROFILE
Nathaniel Blair-stahn
Nathan Smith developed and maintained complex epidemiological and medical models in the ihmeuw/vivarium_research repository, focusing on maternal disorders and Alzheimer’s disease. He engineered robust model documentation, validation workflows, and data pipelines using Python, reStructuredText, and Graphviz, ensuring clarity and reproducibility for both technical and clinical audiences. His work included model parameterization, statistical modeling, and integration of CI/CD practices to support continuous delivery and collaborative development. By refining model definitions, enhancing data visualization, and standardizing technical writing, Nathan improved onboarding, traceability, and model calibration. The depth of his contributions established a strong foundation for scalable, maintainable scientific modeling.
Overall Statistics
Feature vs Bugs
87%Features
Repository Contributions
319Total
Bugs
21
Commits
319
Features
135
Lines of code
9,411
Activity Months9
Your Network
120 people
Work History
October 2025
6 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for ihmeuw/vivarium_research: Delivered focused documentation enhancements across model runs, V&V, and BBBM observers to improve traceability, validation transparency, and onboarding. Key updates include model 5 and 6.1 references, V&V notebooks, BBBM observer definitions, step-size and event-time clarifications, and links to related PRs. No major bugs fixed this month; minor quality improvements centered on documentation and table completeness to support audits and reproducibility. Overall impact: clearer validation paths, faster onboarding, and stronger user confidence. Technologies/skills demonstrated: documentation best practices, Git/version control, cross-repo coordination, and model validation workflow maintenance.
6 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for ihmeuw/vivarium_research: Delivered focused documentation enhancements across model runs, V&V, and BBBM observers to improve traceability, validation transparency, and onboarding. Key updates include model 5 and 6.1 references, V&V notebooks, BBBM observer definitions, step-size and event-time clarifications, and links to related PRs. No major bugs fixed this month; minor quality improvements centered on documentation and table completeness to support audits and reproducibility. Overall impact: clearer validation paths, faster onboarding, and stronger user confidence. Technologies/skills demonstrated: documentation best practices, Git/version control, cross-repo coordination, and model validation workflow maintenance.
October 2025
September 2025
64 Commits • 33 Features
Sep 1, 2025September 2025 (ihmeuw/vivarium_research) monthly summary for performance review: - Key features delivered focused on BBBM incidence, mortality modeling, notation, and documentation; implemented numerical robustness in modeling; and improved data sources integration and V&V readiness. - Business value centered on improved accuracy of incidence/mortality estimates, clearer theoretical definitions, reproducibility, and faster onboarding for new models (4.2–4.5) with run requests and V&V links. - Notable outcomes include concrete guidance for how to compute BBBM incidence, first pass mortality counting for BBBM/MCI with mortality-rate definitions, clearer B_g(t) and related notation, and a shift from gamma to Weibull distributions with a distribution object to compute means, boosting numerical stability and traceability. - Documentation and data infrastructure were strengthened via data sources table maintenance, link enhancements, and targeted UX labels to reduce confusion in population datasets and mortality sections. - The work supports scalable model development, enhanced V&V coverage, and smoother integration of upcoming models and analyses.
September 2025
64 Commits • 33 Features
Sep 1, 2025September 2025 (ihmeuw/vivarium_research) monthly summary for performance review: - Key features delivered focused on BBBM incidence, mortality modeling, notation, and documentation; implemented numerical robustness in modeling; and improved data sources integration and V&V readiness. - Business value centered on improved accuracy of incidence/mortality estimates, clearer theoretical definitions, reproducibility, and faster onboarding for new models (4.2–4.5) with run requests and V&V links. - Notable outcomes include concrete guidance for how to compute BBBM incidence, first pass mortality counting for BBBM/MCI with mortality-rate definitions, clearer B_g(t) and related notation, and a shift from gamma to Weibull distributions with a distribution object to compute means, boosting numerical stability and traceability. - Documentation and data infrastructure were strengthened via data sources table maintenance, link enhancements, and targeted UX labels to reduce confusion in population datasets and mortality sections. - The work supports scalable model development, enhanced V&V coverage, and smoother integration of upcoming models and analyses.
August 2025
73 Commits • 37 Features
Aug 1, 2025August 2025 (2025-08) delivered substantial groundwork and documentation enhancements for the ihmeuw/vivarium_research model suite, focusing on clarity, maintainability, and the foundation for future model versions (pre-dementia stages, MCI). The work strengthens modeling fidelity, reproducibility, and business value by aligning notation, expanding the Alzheimer’s disease population framework, enriching state and incidence/prevalence representations, and expanding validation and documentation coverage.
73 Commits • 37 Features
Aug 1, 2025August 2025 (2025-08) delivered substantial groundwork and documentation enhancements for the ihmeuw/vivarium_research model suite, focusing on clarity, maintainability, and the foundation for future model versions (pre-dementia stages, MCI). The work strengthens modeling fidelity, reproducibility, and business value by aligning notation, expanding the Alzheimer’s disease population framework, enriching state and incidence/prevalence representations, and expanding validation and documentation coverage.
August 2025
July 2025
50 Commits • 18 Features
Jul 1, 2025July 2025 monthly summary for ihmeuw/vivarium_research: Key features delivered, major bugs fixed, overall impact, and technologies demonstrated. Work spanned ANC attendance classification updates, AI ultrasound observer enhancements, facility choice core improvements, model runs/versioning refinements, and documentation/validation updates. Deliverables improved clinical classification clarity, data capture for facility decisions, model run metadata, and V&V traceability across the project.
July 2025
50 Commits • 18 Features
Jul 1, 2025July 2025 monthly summary for ihmeuw/vivarium_research: Key features delivered, major bugs fixed, overall impact, and technologies demonstrated. Work spanned ANC attendance classification updates, AI ultrasound observer enhancements, facility choice core improvements, model runs/versioning refinements, and documentation/validation updates. Deliverables improved clinical classification clarity, data capture for facility decisions, model run metadata, and V&V traceability across the project.
June 2025
60 Commits • 26 Features
Jun 1, 2025June 2025 monthly summary for ihmeuw/vivarium_research focusing on business value and technical achievements. Delivered comprehensive model probability updates, standardized naming (IFD), and extensive documentation and visualization enhancements. Achieved improved model calibration with updated BemONC/CEmONC probabilities and updated copula parameters aligned to Ethiopia data; improved readability and navigability through table formatting, cross-linking, and legends; established interventions on ultrasound node in model scope; and implemented reliability improvements by removing depth restriction and preterm references in docs.
60 Commits • 26 Features
Jun 1, 2025June 2025 monthly summary for ihmeuw/vivarium_research focusing on business value and technical achievements. Delivered comprehensive model probability updates, standardized naming (IFD), and extensive documentation and visualization enhancements. Achieved improved model calibration with updated BemONC/CEmONC probabilities and updated copula parameters aligned to Ethiopia data; improved readability and navigability through table formatting, cross-linking, and legends; established interventions on ultrasound node in model scope; and implemented reliability improvements by removing depth restriction and preterm references in docs.
June 2025
May 2025
1 Commits • 1 Features
May 1, 2025Month: 2025-05 focused on delivering documentation enhancements for the Facility Choice Model in the ihmeuw/vivarium_research repository. The work improves clarity for developers and supports accurate risk assessment workflows, setting a solid foundation for future feature work and knowledge transfer.
May 2025
1 Commits • 1 Features
May 1, 2025Month: 2025-05 focused on delivering documentation enhancements for the Facility Choice Model in the ihmeuw/vivarium_research repository. The work improves clarity for developers and supports accurate risk assessment workflows, setting a solid foundation for future feature work and knowledge transfer.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024: Focused on documentation quality improvements for ihmeuw/vivarium_research to support maintainability and contributor onboarding. Delivered a targeted documentation fix with no functional changes. The change improves accuracy and readability, aiding users and contributors in understanding the repository.
1 Commits • 1 Features
Dec 1, 2024December 2024: Focused on documentation quality improvements for ihmeuw/vivarium_research to support maintainability and contributor onboarding. Delivered a targeted documentation fix with no functional changes. The change improves accuracy and readability, aiding users and contributors in understanding the repository.
December 2024
November 2024
51 Commits • 17 Features
Nov 1, 2024November 2024 monthly summary for ihmeuw/vivarium_research focusing on delivering model enhancements, expanding metrics, and improving documentation and CI reliability. Highlights include Graphviz integration for the maternal sepsis model, state/transition definitions and updated decision tree, expanded data tables for IR/CFR/YLDs, and comprehensive documentation cleanups. These work streams advance model transparency, decision-support capabilities, and maintainability, delivering measurable business value for stakeholders relying on the maternal sepsis modeling pipeline.
November 2024
51 Commits • 17 Features
Nov 1, 2024November 2024 monthly summary for ihmeuw/vivarium_research focusing on delivering model enhancements, expanding metrics, and improving documentation and CI reliability. Highlights include Graphviz integration for the maternal sepsis model, state/transition definitions and updated decision tree, expanded data tables for IR/CFR/YLDs, and comprehensive documentation cleanups. These work streams advance model transparency, decision-support capabilities, and maintainability, delivering measurable business value for stakeholders relying on the maternal sepsis modeling pipeline.
October 2024
13 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — ihmeuw/vivarium_research. Focused on consolidating and documenting maternal disorders for the GBD 2021 MNCNH model, with planning for Vivarium integration. Delivered comprehensive documentation updates and setup for future modeling work: new pages for maternal disorders and maternal hemorrhage, stub pages for sepsis and obstructed labor, expanded toctree with subcauses, defined waves for submodels, introduced initial Vivarium modeling strategy, and diagrams/state definitions. Added cross-references and diagrams to support review and maintenance. This work strengthens the documentation baseline, clarifies modeling approach, and enables smoother collaboration and integration with Vivarium models.
13 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — ihmeuw/vivarium_research. Focused on consolidating and documenting maternal disorders for the GBD 2021 MNCNH model, with planning for Vivarium integration. Delivered comprehensive documentation updates and setup for future modeling work: new pages for maternal disorders and maternal hemorrhage, stub pages for sepsis and obstructed labor, expanded toctree with subcauses, defined waves for submodels, introduced initial Vivarium modeling strategy, and diagrams/state definitions. Added cross-references and diagrams to support review and maintenance. This work strengthens the documentation baseline, clarifies modeling approach, and enables smoother collaboration and integration with Vivarium models.
October 2024
Activity
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Quality Metrics
Correctness94.8%
Maintainability94.8%
Architecture93.4%
Performance90.0%
AI Usage21.0%
Skills & Technologies
Programming Languages
PythonRSTSVGYAMLreStructuredTextrst
Technical Skills
CI/CDData AnalysisData ModelingData VisualizationDiagrammingDocumentationDocumentation ManagementEpidemiology ModelingGitHub ActionsMathematical ModelingMathematical ProofMathematicsMedical DataMedical ModelingModel Configuration
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