Ziyin Wu
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Research and analysis
Rotterdam Breast Cancer: Confounding, Overlap Weighting & RFS

Rotterdam Breast Cancer: Confounding, Overlap Weighting & RFS
Biostatistics

A reproducible analysis of 2,982 patients: crude Kaplan–Meier comparison, positivity diagnostics, and node-positive overlap-weighted RFS/RMST. Full Japanese, Chinese and English walkthroughs.
Multilingual MLLM Unlearning

Multilingual MLLM Unlearning
AI

Undergraduate research on cross-lingual consistency in unlearning for large multimodal models, with interest in trustworthy AI and model behavior analysis.
Biostatistics Research Proposal

Biostatistics Research Proposal
Research

Research planning around clinical research methodology, causal inference, target trial emulation, and real-world data analysis.
Simulated RCT: Design & Statistical Evaluation

Simulated RCT: Design & Statistical Evaluation
Biostatistics

Full-cycle simulated RCT with 6 patient-cards: baseline balance check, t-test for treatment effect, and power-analysis-based sample size design (n=86).
Kaplan-Meier Estimation & Right Censoring

Kaplan-Meier Estimation & Right Censoring
Biostatistics

Simulation-based investigation of KM estimator behavior under right-censoring, with veteran dataset application and log-rank test.
Metronome Synchronization Analysis

Metronome Synchronization Analysis
CV / Dynamics

Video-based analysis of metronome synchronization using OpenCV, HSV segmentation, centroid tracking, angle estimation, and time-series visualization.
Bayesian Inference: Dirichlet Conjugate Prior

Bayesian Inference: Dirichlet Conjugate Prior
Academic

From conditional probability and Bayes' theorem through MLE for multinomial distributions, to the Dirichlet distribution as a natural conjugate prior.
Inference using Bayesian Mixture Prior Models

Inference using Bayesian Mixture Prior Models
Academic

Bayesian inference using a mixture of Beta prior distributions.
Multiple Linear Regression and Outlier Analysis

Multiple Linear Regression and Outlier Analysis
Biostatistics

Evaluating the impact of outliers on multiple linear regression models and simulating confidence interval coverage.
Numerical Solution of Burgers' Equation

Numerical Solution of Burgers' Equation
Academic

Solving nonlinear PDE using upwind, conservative schemes and Godunov's method.
Pattern Recognition: K-NN and LDA

Pattern Recognition: K-NN and LDA
Academic

Implementation of K-Nearest Neighbors and Linear Discriminant Analysis.
Simple Linear Regression and Statistical Inference

Simple Linear Regression and Statistical Inference
Academic

Pearson correlation coefficient and least squares estimation for simple linear regression.
Mathematical Optimization: Taylor Expansion & Max-Plus

Mathematical Optimization: Taylor Expansion & Max-Plus
Academic

MATLAB implementation of Taylor series approximation and Max-Plus algebra matrix operations.
Statistical Inference: Estimation and Hypothesis Testing

Statistical Inference: Estimation and Hypothesis Testing
Academic

Simulation-based confidence interval estimation and two-sided hypothesis testing.
Writing and notes
Japan Statistical Society Certificate Pre-1 (Best Performance Award)

Japan Statistical Society Certificate Pre-1 (Best Performance Award)
JSSC

Study notes from passing JSSC Pre-1 in one month: textbook focus, past-paper difficulty comparison, and a workflow tailored to information-engineering students.
Simulation Theory: M/M/1 Queuing Model

Simulation Theory: M/M/1 Queuing Model
Academic

Evaluating service efficiency and queue length using the M/M/1 queuing model.
A* Search Algorithm for Path Planning

A* Search Algorithm for Path Planning
Academic

Implementation of the classical A* search algorithm for optimal pathfinding.
Image Processing: Spatial Filtering and FFT

Image Processing: Spatial Filtering and FFT
Academic

Image noise reduction and frequency domain filtering using 2D Fast Fourier Transform.
Data Compression via Matrix Dimensionality Reduction

Data Compression via Matrix Dimensionality Reduction
Academic

Compressing and reconstructing handwritten digit images using linear algebra.
Simulation of Binomial Distribution and LLN

Simulation of Binomial Distribution and LLN
Academic

Visualizing Law of Large Numbers and Central Limit Theorem via random number simulation.
項目反応理論（IRT）に基づく動的e-Testingシステムの構築

項目反応理論（IRT）に基づく動的e-Testingシステムの構築
IRT / Web Sys

従来のテスト理論の限界を克服し、IRT（2パラメータロジスティックモデル）、ベイズ推論、ニュートン法を用いて受験者の能力値を動的に推定するe-Testingシステムのフルスクラッチ開発。
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