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dennis20413/README.md

Hi, I'm Dennis Chen (YunHao Chen) 👋

Data Science student (GPA 3.9x) who turns messy, real-world data into models people can actually use and understand.

I build end-to-end: data pipelines, feature engineering, machine learning, and clear evaluation — with reproducible, tested code. My work spans applied ML, NLP, analytics, and quantitative finance.

🧰 Tech Stack

Python pandas NumPy scikit-learn SQL Streamlit

  • Languages: Python, SQL, VBA
  • ML & Stats: Classification, regression, NLP, feature engineering, cross-validation, model evaluation & interpretability
  • Analytics & Data Eng: SQL (window functions, CTEs, cohorts), EDA & visualization, REST API ingestion, large-scale data cleaning
  • Apps: Streamlit (interactive, deployable ML apps)

📌 Featured Projects

🤖 Machine Learning & Data Science

Project What it demonstrates
LoL Win Predictor — Live App End-to-end & deployable: a trained model wrapped in an interactive Streamlit web app
Esports Win Predictor (ML + Riot API) ML classifier with feature engineering, cross-validation, and a real Riot API data pipeline
NLP Sentiment Analysis Text preprocessing (negation handling), TF-IDF, interpretable classification
Customer Insights EDA Data-quality auditing, segment profiling, correlation analysis & visualization

🗄️ Data & Analytics

Project What it demonstrates
SQL Sales Analytics Window functions, CTEs, cohort retention, RFM segmentation
Forensic Data Cleaning Pipeline Multi-phase cleaning & reconciliation of a 50k-row dirty dataset

📈 Quantitative Finance

Project What it demonstrates
Multi-Factor Stock Model Factor construction, Information Coefficient evaluation, quantile portfolios
GARCH Volatility & VaR Time-series volatility modeling, forecasting, Value-at-Risk
Pairs Trading — Stat Arb Cointegration testing, z-score signals, market-neutral backtest
Portfolio Optimization Mean-variance, min-variance & risk-parity allocation
Quant Backtesting Framework Strategy backtesting with realistic costs and no look-ahead bias
Piecewise Regression — Equity Analysis Statistical trend decomposition, validated against a reference tool

Every project includes unit tests and an honest methodology write-up — limitations stated, not hidden.

📫 Reach me

LinkedIn   📧 dennis07250725@gmail.com

Currently a junior building toward data science / machine learning roles.

Pinned Loading

  1. factor-model factor-model Public

    Cross-sectional multi-factor stock selection — momentum/volatility/reversal factors, Information Coefficient evaluation, quantile portfolios, and composite alpha.

    Python

  2. eda-customer-insights eda-customer-insights Public

    Exploratory data analysis of customer data — data-quality auditing, segment profiling, correlation analysis, churn drivers, and presentation-ready visualizations.

    Python

  3. esports-win-predictor-LoL esports-win-predictor-LoL Public

    Machine-learning classifier predicting League of Legends match outcomes from mid-game snapshots — feature engineering, cross-validated training, interpretable feature importances, and a real Riot A…

    Python

  4. esports-winrate-app esports-winrate-app Public

    Interactive Streamlit web app predicting League of Legends win probability in real time from the live game state — an end-to-end, deployable ML demo.

    Python

  5. nlp-sentiment-analysis nlp-sentiment-analysis Public

    End-to-end NLP sentiment classifier — text preprocessing with negation handling, TF-IDF features, interpretable logistic regression, and honest evaluation.

    Python

  6. sql-sales-analytics sql-sales-analytics Public

    Analytical SQL portfolio on an e-commerce dataset — joins, window functions (RANK/LAG/NTILE), CTEs, cohort retention, and RFM segmentation.

    Python