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RentoSaijo/README.md

About

✉️ Email | LinkedIn | X | YouTube

I build hockey analytics from the data layer up. I created nhlscraper, a CRAN R package with 5,000+ downloads covering 125+ NHL/ESPN endpoints. During my NHL Stats R&D internship, I helped refine a 71-value puck-touch taxonomy and built an R Shiny/JavaScript tracking system with 100+ validation rules; across 5 NHL games, it tripled tracking throughput and prevented roughly 500 detectable data-entry errors per game. I study Statistics & Data Science and Computer Science at Connecticut College and am joining Clear Sight Analytics as a 2026–27 Analytics Engineer.

Experience

🏒 Analytics Engineer @ Clear Sight Analytics | R / SQL / Power BI

To be added.

🏒 Intern, Stats R&D @ National Hockey League | R / SQL / JavaScript

Co-improved a 71-value puck-touch taxonomy spanning 25 actions, 9 touch types, and 37 outcomes, testing 15 V1-to-V2 revisions and documenting definitions, clarifications, and standards for future trackers and auditors. Engineered an R Shiny/JavaScript tracker app backed by SQLite and Parquet with 100+ row- and sequence-level validation rules, outcome inference, and synchronized visualizers; then, led 3 user training sessions for the app. Deployed the system to complete ground-truth tracking for 5 NHL games, tripling the previous workflow’s throughput and eliminating ~500 detectable human-errors per game.

Projects

🏒 nhlscraper | R / C / Developer Tools

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. 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.

⛏️ bedrocktrader | R

Minecraft: Bedrock Edition stores villager trading as nested random-generation rules rather than the concrete offers players see. I created bedrocktrader, an R package that converts Mojang’s pinned source tables into three probability-aware views covering 281 trade combinations, 2,787 item specifications, and 30,592 exact price-and-item offers across 13 professions. Derived an analytical engine that accounts for trade selection, repeated source entries, biome and dimension restrictions, emerald prices, and complete enchantment sets without simulation; for example, the package calculates a 2.79% chance that a fully unlocked librarian offers Mending for at most 26 emeralds.

Competitions

Co-developed calibrated size above expected (CSAx), a frame-relative measure of how “big” NHL forwards play, using 10 contact and interior-shot features across 1,763 forward-seasons. Among forwards in comparable roles, one standard deviation higher CSAx was associated with 22% higher adjusted odds of logging at least 300 NHL minutes the following season. The competition paper and reproducible R workflow also examine scouting reports, contracts, and playoff availability.

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. 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 21 5

  2. nhlplotter nhlplotter Public

    Plotter for National Hockey League Data on R

    R 1

  3. NHL_DB NHL_DB Public

    Database for nhlscraper

    R 1

  4. bedrocktrader bedrocktrader Public

    Analyze Minecraft: Bedrock Edition Villager Trades

    R 1