Julián Úsuga Ortiz
Data Scientist · Statistician · Developer
Personal site and blog. I write about data science, statistical analysis, database systems, and software development.
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How to Use Claude Code
A practical guide to Claude Code — slash commands, sub-agents, hooks, skills, and parallel workflows. Updated April 2026 with the commands that actually matter.
howto claude tools
Speed in Relational DB Management Systems
A comparative study of processing speed across three popular DBMS - SQLite, MySQL, and PostgreSQL - analyzing performance with text data using a multi-factor experimental model.
experiment dbms sql
Modeling Survival times in African countries using rstanarm
In this study we used a Bayesian Approach to model survival times of the people in different African countries.
survival analysis rstanarm bayesian approach