Economics & Markets
International trade, macroeconomic context, alternative data, and market research.
Professional Portfolio · Sangmin Lee
Turning ambiguous questions into practical, evidence-led decisions.
Economics and business student turning data, financial research, and service thinking into practical decisions.
As an International Trade major and Business Administration double-major candidate, I have worked across customer analytics, alternative-data economics, corporate valuation, fintech systems, and service MVP planning. I separate what the evidence supports from what still requires validation.
Working method
- 01Business question
- 02Evidence
- 03Analysis
- 04Interpretation
- 05Practical decision
Capability summary
Business context, tested through evidence.
My work begins with a decision question, selects evidence appropriate to that question, and finishes by separating supported findings from assumptions and next validation steps.
Business & Finance
Customer strategy, financial statements, corporate valuation, and industry analysis.
Data & Research
Python, statistics, regression, classification, explainable AI, and survey analysis.
Execution & Communication
Dashboards, analytical reports, MVPs, operating workflows, and decision recommendations.
Selected evidence highlights
What the evidence demonstrates—and where it stops.
Each highlight connects source-backed evidence to a capability while keeping scope and validation boundaries visible. Project cards remain the route to the full cases.
Evidence
7,043 telecom customer records
Demonstrates · Customer segmentation, explainable classification, and action-oriented retention planning.
Scope · The 5.0 percentage-point churn reduction is a proposed target, not an achieved result.
Evidence
R-squared = 0.819
Demonstrates · Economic research using satellite data, public indicators, and regression analysis.
Scope · This is explanatory fit in the reported simple model, not prediction accuracy or causal proof.
Evidence
2020–2024 financial-ratio review
Demonstrates · Financial statement analysis and comparison of DCF, APV, and relative valuation.
Scope · A conditional classroom analysis; valuation arithmetic requires audit before public use.
Evidence
Live-server paper-trading architecture
Demonstrates · Broker abstraction, bot control, dashboards, logging, and operational validation.
Scope · Paper-trading validation only; no real-money operation or performance claim.
Selected work
Seven evidence-led case studies.
Each case follows the same path: question, evidence, analysis, interpretation, and practical decision value.
01Customer Analytics · Strategy
Telecom Customer Churn Analysis
Business question
Which customers are most likely to leave, why are they at risk, and which retention response fits each segment?
7,043 recordsContract & tenure EDA7 models compared
View case study →
02Economics · Alternative Data
Satellite Night-Light GDP Analysis
Business question
Can night-light intensity help explain GDP where official statistics are limited, and do urban population and electricity access change that relationship?
973 raw rows820 merged observationsReported R² 0.819
View case study →
03Financial Research · Strategy
Korean Air Financial Analysis
Business question
How should Korean Air be evaluated when post-pandemic recovery, large investment needs, leverage, and uncertain cash-flow assumptions cause valuation methods to diverge?
2020–2024 ratiosDCF · APV · MultiplesWACC ≈ 2.8%
View case study →
04Fintech · Service Operations
Quant Trading Fleet
Business question
What operating infrastructure is required to move trading rules from standalone scripts into a controllable and observable service?
Paper tradingBroker abstractionDashboard & logs
View case study →
05Applied Analytics · Model Selection
Financial AI Model Study
Business question
How do preprocessing, regularization, model complexity, and hyperparameters affect validation and test performance?
4 assignmentsPCA · SVRANN · DNN
View case study →
06Service Planning · MVP
Phorage Brand and Commerce MVP
Business question
How can a personal photography concept be translated into a testable product and service experience before public launch?
Pre-launch MVPPhysical goodsCommerce workflow
View case study →
07Research Design · Statistics
Blood Type and Personality Survey Study
Business question
Does a familiar social belief about blood type and personality remain supported when translated into hypotheses and tested with survey data?
101 responsesChi-square testsObserved vs expected
View case study →
Continue the conversation
Looking for roles where evidence and business context belong together.
Open to internship and entry-level opportunities across data analysis, financial and market research, fintech, strategy, BizOps, and service planning.