halley1116/2025_DA_study
Jan 2025 – Jan 2025
1 Month active
Languages Used
Jupyter NotebookPython
Technical Skills
Category EncodersData AnalysisData PreprocessingData VisualizationFeature EngineeringGridSearchCV
LEEJIYU
PROFILE
Leejiyu
Worked on the halley1116/2025_DA_study repository to enhance notebook-based modeling and churn analysis workflows. Developed end-to-end Lasso regression pipelines with data splitting, GridSearchCV hyperparameter tuning, scaling, and detailed evaluation using Python and Scikit-learn. Conducted comparative experiments across multiple regression models, ensuring standardized preprocessing and reproducible results. Improved the churn analysis notebook by refining data merging, handling missing values, encoding categorical features, and applying chi-squared feature importance testing. Added a localized UI element by printing a Korean greeting in the Python output. Emphasized clear evaluation outputs and business-focused insights throughout all data analysis and modeling tasks.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
7Total
Bugs
0
Commits
7
Features
4
Lines of code
4,949
Activity Months1
Your Network
1140 peopleWork History
January 2025
7 Commits • 4 Features
Jan 1, 2025January 2025: Delivered robust notebook-based modeling enhancements and churn analysis improvements in halley1116/2025_DA_study. Implemented end-to-end Lasso regression with data splitting, GridSearchCV hyperparameter tuning, scaling, and comprehensive evaluation (MSE, R2); updated dataset to insurance_dataset.csv and added granular alpha exploration and feature importance assessment. Conducted extensive regression model experiments (RandomForest, Ridge, SVR, Linear Regression, GradientBoostingRegressor) with consistent preprocessing and cross-model evaluation. Enhanced churn analysis notebook with improved data merging, cleanup, missing value checks, categorical feature handling, label encoding, and chi-squared feature importance testing. Added a UI improvement that prints a Korean greeting in Python output. All changes emphasize reproducibility, clear evaluation outputs, and business-focused insights.
7 Commits • 4 Features
Jan 1, 2025January 2025: Delivered robust notebook-based modeling enhancements and churn analysis improvements in halley1116/2025_DA_study. Implemented end-to-end Lasso regression with data splitting, GridSearchCV hyperparameter tuning, scaling, and comprehensive evaluation (MSE, R2); updated dataset to insurance_dataset.csv and added granular alpha exploration and feature importance assessment. Conducted extensive regression model experiments (RandomForest, Ridge, SVR, Linear Regression, GradientBoostingRegressor) with consistent preprocessing and cross-model evaluation. Enhanced churn analysis notebook with improved data merging, cleanup, missing value checks, categorical feature handling, label encoding, and chi-squared feature importance testing. Added a UI improvement that prints a Korean greeting in Python output. All changes emphasize reproducibility, clear evaluation outputs, and business-focused insights.
January 2025
Activity
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Quality Metrics
Correctness82.8%
Maintainability82.8%
Architecture77.2%
Performance71.4%
AI Usage22.8%
Skills & Technologies
Programming Languages
Jupyter NotebookPython
Technical Skills
Category EncodersData AnalysisData PreprocessingData VisualizationFeature EngineeringGridSearchCVLasso RegressionMachine LearningPandasPythonRegression AnalysisRegression ModelingScikit-learnScripting
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