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Mitzi Morris

PROFILE

Mitzi Morris

Over six months, contributed to the stan-dev/stan and stan-dev/docs repositories by delivering features and fixes that improved statistical computing workflows and documentation quality. Enhanced MCMC diagnostics and sampling robustness through C++ code changes, including improved quantile calculations, step size adaptation safeguards, and expanded unit testing. Focused on documentation clarity by updating CmdStan guides, refining build instructions, and resolving rendering issues using Markdown, HTML, and Python scripting. Addressed onboarding and developer experience by clarifying technical documentation and streamlining build processes. Demonstrated strengths in algorithm optimization, error handling, and CI/CD, resulting in more reliable diagnostics, maintainable code, and accessible user guides.

Overall Statistics

Feature vs Bugs

70%Features

Repository Contributions

17Total
Bugs
3
Commits
17
Features
7
Lines of code
8,974,690
Activity Months6

Work History

March 2026

2 Commits • 1 Features

Mar 1, 2026

March 2026 monthly summary focused on theDocumentation domain: Delivered enhancements to documentation generation and management in stan-dev/docs, and fixed Safari anchor scrolling on documentation pages. These changes improve authoring workflows, ensure up-to-date docs, and provide smoother navigation for readers and users.

August 2025

1 Commits • 1 Features

Aug 1, 2025

In August 2025, focused on documentation improvements for stan-dev/docs, delivering targeted clarifications for gp_cov functions through HTML comments. This is a documentation-only change with no runtime impact, aimed at improving maintainability, onboarding, and developer experience. No code changes or bug fixes were required apart from the documentation update.

April 2025

2 Commits

Apr 1, 2025

April 2025 (2025-04) monthly summary for stan-dev/stan: Key feature/bug fix delivered: robust step size adaptation for HMC/NUTS sampler with safeguards and improved adaptation timing; changes to prevent exponentiating non-positive values and to update epsilon only after sufficient adaptation steps; unit tests added covering edge cases and various scheduling parameters; changes refined per code review.

March 2025

1 Commits

Mar 1, 2025

Month: 2025-03 — Documentation stability and user-guide quality improvements for stan-dev/docs. Key feature delivered: fix and stabilization of funnel plot rendering and example links in the Stan User Guide, along with navigation enhancements. Major bugs fixed: funnel plot display issues and broken links to funnel plot examples. Overall impact: improved documentation reliability, user onboarding, and reduced friction for analysts using funnel plots in Stan docs. Technologies/skills: debugging Markdown/HTML rendering, link integrity testing, doc tooling, repository maintenance.

January 2025

2 Commits • 1 Features

Jan 1, 2025

January 2025 monthly summary for stan-dev/docs: Focused on developer experience and build reproducibility through documentation updates. Delivered clearer local build instructions with guidance to clone the quarto-config submodule and improved build.py examples, plus enhanced Quarto-config guidance for consistent theming across Stan website and docs. No major bugs fixed this month; main impact is faster onboarding and reliable local builds. Technologies demonstrated include documentation authoring, submodule management, and Quarto-based theming workflows.

November 2024

9 Commits • 4 Features

Nov 1, 2024

Monthly work summary for 2024-11 focusing on delivering user-facing features, improving robustness, and enabling more reliable diagnostics across Stan repositories. The month emphasizes documentation quality, math/statistics correctness, and code clarity to drive better user outcomes and maintainable codebase.

Activity

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Quality Metrics

Correctness90.6%
Maintainability93.0%
Architecture85.8%
Performance86.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

BashC++HTMLMarkdownPythonQMLR MarkdownShellYAML

Technical Skills

Algorithm OptimizationBayesian InferenceBuild ProcessC++CI/CDCode ClarityCode ReviewData ParsingDocumentationError HandlingException HandlingFile I/OGitHub ActionsMCMCMarkdown

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

stan-dev/stan

Nov 2024 Apr 2025
2 Months active

Languages Used

C++

Technical Skills

C++Code ClarityCode ReviewData ParsingError HandlingException Handling

stan-dev/docs

Nov 2024 Mar 2026
5 Months active

Languages Used

QMLMarkdownShellR MarkdownBashHTMLPythonYAML

Technical Skills

DocumentationTechnical WritingBuild ProcessCI/CDGitHub ActionsMarkdown