datanalysis-credit-risk

作者： github

信貸風險數據清洗與變量篩選流程，適用於貸前建模。執行11個獨立步驟，涵蓋數據加載、異常時期過濾、缺失率分析、低IV與高PSI變量剔除、空值重要性去噪，以及基於相關性的特徵消除。支持組織層級分析，具備獨立建模與樣本外（OOS）樣本處理功能，並提供IV與PSI計算的多進程加速。生成包含15項內容的綜合Excel報告。

npx skills add https://github.com/github/awesome-copilot --skill datanalysis-credit-risk

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Data Cleaning and Variable Screening

Quick Start

# Run the complete data cleaning pipeline
python ".github/skills/datanalysis-credit-risk/scripts/example.py"

Complete Process Description

The data cleaning pipeline consists of the following 11 steps, each executed independently without deleting the original data:

Get Data - Load and format raw data
Organization Sample Analysis - Statistics of sample count and bad sample rate for each organization
Separate OOS Data - Separate out-of-sample (OOS) samples from modeling samples
Filter Abnormal Months - Remove months with insufficient bad sample count or total sample count
Calculate Missing Rate - Calculate overall and organization-level missing rates for each feature
Drop High Missing Rate Features - Remove features with overall missing rate exceeding threshold
Drop Low IV Features - Remove features with overall IV too low or IV too low in too many organizations
Drop High PSI Features - Remove features with unstable PSI
Null Importance Denoising - Remove noise features using label permutation method
Drop High Correlation Features - Remove high correlation features based on original gain
Export Report - Generate Excel report containing details and statistics of all steps

Core Functions

Function	Purpose	Module
`get_dataset()`	Load and format data	references.func
`org_analysis()`	Organization sample analysis	references.func
`missing_check()`	Calculate missing rate	references.func
`drop_abnormal_ym()`	Filter abnormal months	references.analysis
`drop_highmiss_features()`	Drop high missing rate features	references.analysis
`drop_lowiv_features()`	Drop low IV features	references.analysis
`drop_highpsi_features()`	Drop high PSI features	references.analysis
`drop_highnoise_features()`	Null Importance denoising	references.analysis
`drop_highcorr_features()`	Drop high correlation features	references.analysis
`iv_distribution_by_org()`	IV distribution statistics	references.analysis
`psi_distribution_by_org()`	PSI distribution statistics	references.analysis
`value_ratio_distribution_by_org()`	Value ratio distribution statistics	references.analysis
`export_cleaning_report()`	Export cleaning report	references.analysis

Parameter Description

Data Loading Parameters

DATA_PATH: Data file path (best are parquet format)
DATE_COL: Date column name
Y_COL: Label column name
ORG_COL: Organization column name
KEY_COLS: Primary key column name list

OOS Organization Configuration

OOS_ORGS: Out-of-sample organization list

Abnormal Month Filtering Parameters

min_ym_bad_sample: Minimum bad sample count per month (default 10)
min_ym_sample: Minimum total sample count per month (default 500)

Missing Rate Parameters

missing_ratio: Overall missing rate threshold (default 0.6)

IV Parameters

overall_iv_threshold: Overall IV threshold (default 0.1)
org_iv_threshold: Single organization IV threshold (default 0.1)
max_org_threshold: Maximum tolerated low IV organization count (default 2)

PSI Parameters

psi_threshold: PSI threshold (default 0.1)
max_months_ratio: Maximum unstable month ratio (default 1/3)
max_orgs: Maximum unstable organization count (default 6)

Null Importance Parameters

n_estimators: Number of trees (default 100)
max_depth: Maximum tree depth (default 5)
gain_threshold: Gain difference threshold (default 50)

High Correlation Parameters

max_corr: Correlation threshold (default 0.9)
top_n_keep: Keep top N features by original gain ranking (default 20)

Output Report

The generated Excel report contains the following sheets:

汇总 - Summary information of all steps, including operation results and conditions
机构样本统计 - Sample count and bad sample rate for each organization
分离OOS数据 - OOS sample and modeling sample counts
Step4-异常月份处理 - Abnormal months that were removed
缺失率明细 - Overall and organization-level missing rates for each feature
Step5-有值率分布统计 - Distribution of features in different value ratio ranges
Step6-高缺失率处理 - High missing rate features that were removed
Step7-IV明细 - IV values of each feature in each organization and overall
Step7-IV处理 - Features that do not meet IV conditions and low IV organizations
Step7-IV分布统计 - Distribution of features in different IV ranges
Step8-PSI明细 - PSI values of each feature in each organization each month
Step8-PSI处理 - Features that do not meet PSI conditions and unstable organizations
Step8-PSI分布统计 - Distribution of features in different PSI ranges
Step9-null importance处理 - Noise features that were removed
Step10-高相关性剔除 - High correlation features that were removed

Features

Interactive Input: Parameters can be input before each step execution, with default values supported
Independent Execution: Each step is executed independently without deleting original data, facilitating comparative analysis
Complete Report: Generate complete Excel report containing details, statistics, and distributions
Multi-process Support: IV and PSI calculations support multi-process acceleration
Organization-level Analysis: Support organization-level statistics and modeling/OOS distinction