ihmeuw/vivarium_research
Oct 2024 – May 2026
14 Months active
Languages Used
RSTSVGrstPythonYAMLreStructuredTextMarkdownShell
Technical Skills
DocumentationTechnical WritingCI/CDDiagrammingGitHub ActionsMathematical Modeling
Nathaniel Blair-Stahn
PROFILE
Nathaniel Blair-stahn
Over 14 months, contributed to the ihmeuw/vivarium_research repository by developing and refining complex health and epidemiological models, with a strong emphasis on documentation, model validation, and reproducibility. Leveraged Python, LaTeX, and Sphinx to implement model enhancements, statistical analyses, and robust documentation workflows supporting simulation, calibration, and verification processes. Delivered features such as model parameter updates, data visualization, and validation frameworks, while maintaining clarity through technical writing and diagramming. Addressed numerical stability and readability in mathematical modeling, improved onboarding for contributors, and ensured traceable, version-controlled updates. The work enabled reliable model comparisons, scenario analysis, and streamlined collaborative development.
Overall Statistics
Feature vs Bugs
87%Features
Repository Contributions
383Total
Bugs
24
Commits
383
Features
156
Lines of code
721,117
Activity Months14
Your Network
142 peopleSame Organization
@uw.edu132
Shared Repositories
10
Abraham FlaxmanMember
Abraham FlaxmanMember
Jim AlbrightMember
Ali BowmanMember
Syl LutzeMember
Sylvia LutzeMember
Sylvia LutzeMember
Alix PletcherMember
tylerdyMember
Work History
May 2026
15 Commits • 1 Features
May 1, 2026May 2026 monthly summary for ihmeuw/vivarium_research: Focused on documentation quality and correctness for health model equations through extensive LaTeX formatting improvements and controlled rollback to stabilize rendering. Delivered a comprehensive set of documentation refinements, including escaping underscores within LaTeX text commands (and textsf), standardizing syntax, fixing braces, correct limits usage, and improving math environment handling (e.g., aligned/align* with no-wrap) to prevent nesting issues. Made GBD measures readable by rendering them in plaintext where appropriate. Consolidated changes across multiple commits (notably 14 feature commits) and addressed rendering stability by reverting changes that caused inconsistencies (1 revert commit). These efforts improve readability, maintainability, and contributor onboarding, while reducing misinterpretations in model documentation.
15 Commits • 1 Features
May 1, 2026May 2026 monthly summary for ihmeuw/vivarium_research: Focused on documentation quality and correctness for health model equations through extensive LaTeX formatting improvements and controlled rollback to stabilize rendering. Delivered a comprehensive set of documentation refinements, including escaping underscores within LaTeX text commands (and textsf), standardizing syntax, fixing braces, correct limits usage, and improving math environment handling (e.g., aligned/align* with no-wrap) to prevent nesting issues. Made GBD measures readable by rendering them in plaintext where appropriate. Consolidated changes across multiple commits (notably 14 feature commits) and addressed rendering stability by reverting changes that caused inconsistencies (1 revert commit). These efforts improve readability, maintainability, and contributor onboarding, while reducing misinterpretations in model documentation.
May 2026
April 2026
8 Commits • 1 Features
Apr 1, 2026April 2026: Focused on strengthening model validation, documentation, and simulation fidelity for ihmeuw/vivarium_research. Delivered consolidated V&V documentation and Alzheimer’s calibration guidance for models 11.1–12.2, with links to interactive notebooks and months-on-treatment observer details; updated documentation to reflect Alzheimer’s rate calibration and model page naming for clarity. Fixed treatment initiation logic in the susceptible state to prevent tracking of unnecessary or incorrectly initiated treatments, and updated related docs to ensure correct interpretation.
April 2026
8 Commits • 1 Features
Apr 1, 2026April 2026: Focused on strengthening model validation, documentation, and simulation fidelity for ihmeuw/vivarium_research. Delivered consolidated V&V documentation and Alzheimer’s calibration guidance for models 11.1–12.2, with links to interactive notebooks and months-on-treatment observer details; updated documentation to reflect Alzheimer’s rate calibration and model page naming for clarity. Fixed treatment initiation logic in the susceptible state to prevent tracking of unnecessary or incorrectly initiated treatments, and updated related docs to ensure correct interpretation.
March 2026
7 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for ihmeuw/vivarium_research: Delivered substantive improvements to the Vivarium research repo. Key features include Vivarium Documentation and Workflow Improvements and Model Catalog Updates: MSLT and 12.2 additions. These changes enhance reproducibility, onboarding, and decision support by clarifying methodology, expanding model coverage, and linking to verification/validation notebooks. Technical execution reflects strong documentation engineering, catalog data curation, and cross-repo collaboration, backed by clear commit-level changes.
7 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for ihmeuw/vivarium_research: Delivered substantive improvements to the Vivarium research repo. Key features include Vivarium Documentation and Workflow Improvements and Model Catalog Updates: MSLT and 12.2 additions. These changes enhance reproducibility, onboarding, and decision support by clarifying methodology, expanding model coverage, and linking to verification/validation notebooks. Technical execution reflects strong documentation engineering, catalog data curation, and cross-repo collaboration, backed by clear commit-level changes.
March 2026
January 2026
10 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for ihmeuw/vivarium_research: Delivered two major framework updates and documentation enhancements that advance modeling fidelity, scenario analysis, and reproducibility, translating to stronger decision support and cost/state transition insights.
January 2026
10 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for ihmeuw/vivarium_research: Delivered two major framework updates and documentation enhancements that advance modeling fidelity, scenario analysis, and reproducibility, translating to stronger decision support and cost/state transition insights.
December 2025
24 Commits • 14 Features
Dec 1, 2025December 2025 performance summary for ihmeuw/vivarium_research. Delivered extensive model validation and documentation work that enhances traceability, reproducibility, and maintainability. Key efforts included populating model runs and V&V tables through 9.0 with run descriptions, expanding V&V coverage across models 4.5–8.6 (including 7.x and 8.0–8.6) with detailed notes and notebook links, and refining documentation for clarity and consistency. These changes support more reliable model comparisons, faster review cycles, and stronger governance of the V&V process.
24 Commits • 14 Features
Dec 1, 2025December 2025 performance summary for ihmeuw/vivarium_research. Delivered extensive model validation and documentation work that enhances traceability, reproducibility, and maintainability. Key efforts included populating model runs and V&V tables through 9.0 with run descriptions, expanding V&V coverage across models 4.5–8.6 (including 7.x and 8.0–8.6) with detailed notes and notebook links, and refining documentation for clarity and consistency. These changes support more reliable model comparisons, faster review cycles, and stronger governance of the V&V process.
December 2025
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
Activity
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Quality Metrics
Correctness95.2%
Maintainability95.0%
Architecture93.6%
Performance90.8%
AI Usage21.4%
Skills & Technologies
Programming Languages
LaTeXMarkdownPythonRSTSVGShellYAMLreStructuredTextrst
Technical Skills
AI integrationCI/CDData AnalysisData ModelingData VisualizationDiagrammingDocumentationDocumentation ManagementEpidemiology ModelingGitGitHub ActionsLaTeXMathematical ModelingMathematical ProofMathematics
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline