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RentoSaijo/README.md

About

✉️ Email | LinkedIn | X | YouTube

I’m a Statistics & Data Science and Computer Science student at Connecticut College and a sports analytics builder focused on turning raw data into tools teams can actually use. My work combines statistical modeling, software engineering, and on-ice perspective: I’m the author/maintainer of nhlscraper, an R package for collecting, cleaning, modeling, and visualizing NHL/ESPN data; I’ve built expected-goals models, interactive dashboards, and D3 visualizations to study shot quality, player value, and tactical decision-making; and I’ve applied that toolkit professionally as a Stats R&D Intern at NHL. I’m especially interested in hockey data infrastructure, probabilistic modeling, player evaluation, and decision tools that help move analysis from “what happened?” to “what should we do next?”

Projects

🏒 nhlscraper | R / C / Developer Tools

I created and maintain nhlscraper, an R package that makes NHL and ESPN data more accessible by scraping, cleaning, and analyzing data from 125+ API endpoints. Since publishing it on CRAN, the package has surpassed 5,000 downloads, been added to the SportsAnalytics CRAN Task View, and appeared in academic papers and course materials. I also reverse-engineered more than 50 undocumented NHL EDGE endpoints and built native C routines that accelerate play-by-play and shift-processing workflows by up to 167× while preserving reliable R fallbacks.

🏒 rentosrink | Python / R

I built and deployed Rento’s Rink, a Python and Streamlit NHL analytics platform used by more than 1,000 people to explore skater and goalie shot maps, compare player and team performance through xG-based rankings, evaluate free agents, and generate contract scenarios. Behind the interface, I developed multi-season R data pipelines and a leakage-controlled, six-game-state xG system that selects between XGBoost and LightGBM models, alongside contract models trained on 5,394 historical deals using 337 engineered features and achieving an average held-out error of 0.61 percentage points of the salary cap.

🏀 NBAxP | JavaScript / R

NBAxP is a project where I turned raw NBA shot data into an interactive “shot value map” for each team. I scraped and cleaned ~700,000 shots, built an expected-points model using shot context, and visualized results by court region in a D3-powered dashboard with interactive filters and hover tooltips for team-to-team comparisons.

Competitions

I built an end-to-end R pipeline combining AHL player-tracking data with XGBoost and LightGBM models to analyze established 5-on-4 offensive-zone play. I developed Attempted Exploitable Mismatch per State (AEM/state), a coaching-focused metric that measures whether power-play units recognize and attack high-value openings. Across 32 teams, AEM/state correlated with scoring at r = 0.442 and increased team-level explanatory R² from 0.281 to 0.346 beyond xG alone, while revealing actionable puck-movement patterns associated with creating mismatches.

Pinned Loading

  1. nhlscraper nhlscraper Public

    Scraper for National Hockey League Data on R

    R 19 3

  2. nhlplotter nhlplotter Public

    Plotter for National Hockey League Data on R

    R 1

  3. rentosrink rentosrink Public

    Rento's Rink

    Python 1

  4. NHL_DB NHL_DB Public

    Database for nhlscraper.

    R 1