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kva99kva-eng/README.md

Victoria Kupina

Research / Product Analyst focused on neuroscience and digital health.

I build reproducible data projects at the intersection of:

  • SQL and product analytics
  • EEG / fMRI / sleep data
  • machine learning evaluation
  • leakage-aware validation
  • interpretable research workflows
  • digital health MVPs

What I bring

  • SQL / product analytics
  • I can turn an open-ended research question into a reproducible data analysis pipeline.
  • I focus on validation quality, leakage risks, class imbalance and honest limitations.
  • I combine research-style analysis with product thinking: metrics, dashboards, user behavior and decision-making.
  • I am especially interested in sleep, cognitive load, neurotechnology, mental health analytics and digital health products.

Featured Projects

SleepMind SQL Product Analytics

PostgreSQL product analytics case for a synthetic sleep-tracking app.

Focus: SQL, cohort retention, onboarding funnel, A/B testing, churn-risk segmentation, business recommendations.

This project demonstrates how I translate product event data into decisions: activation opportunities, acquisition channel quality, retention analysis and lifecycle interventions.

EEG Cognitive Load Detection

EEG cognitive load classification project using spectral bandpower features, classical ML baselines, CNN modeling and Streamlit demo.

Focus: EEG, ML validation, leakage analysis, subject-independent validation, feature importance.

The key part of this project is the comparison between optimistic window-level validation and more realistic subject-independent validation.

SleepMind AI

Sleep-tech product analytics and ML MVP with synthetic user-day data, sleep-quality prediction, threshold analysis, Streamlit dashboard and rule-based AI sleep coach.

Focus: product metrics, ML evaluation, threshold tuning, dashboarding, safe non-medical AI logic.

This project shows how ML outputs can be connected to product decisions and user-facing recommendations.

Psychiatric Brain Connectivity Analysis

Exploratory resting-state fMRI functional connectivity analysis across psychiatric diagnostic groups.

Focus: fMRI, connectivity matrices, permutation testing, FDR correction, research interpretation.

This project demonstrates a reproducible neuroscience workflow with careful limitations and no overclaiming.

Sleep Staging and Fragmentation Detection

Sleep-EDF based sleep-staging and fragmentation-analysis project.

Focus: hypnogram processing, sleep-stage classification, confusion matrix analysis, fragmentation metrics.

This project connects baseline sleep-stage predictions with downstream sleep-quality metrics.

Core Skills

  • SQL / PostgreSQL
  • Python
  • pandas / NumPy
  • product analytics
  • cohort analysis / retention / funnels
  • A/B testing
  • scikit-learn
  • machine learning evaluation
  • EEG / fMRI / sleep data analysis
  • Streamlit dashboards

Current Focus

I am building a focused portfolio for roles in:

  • data analytics;
  • research analytics;
  • product analytics;
  • healthtech / digital health analytics;
  • neuroscience and sleep-tech analytics.

Portfolio Direction

My goal is to work on data problems where behavioral, physiological or product data can be translated into clear insights, validated models and useful user-facing decisions.

Pinned Loading

  1. sleepmind-sql-product-analytics sleepmind-sql-product-analytics Public

    SQL product/research analytics project for a synthetic sleep-tracking healthtech app.

    Python

  2. eeg-cognitive-load-detection eeg-cognitive-load-detection Public

    EEG cognitive load detection with bandpower ML baselines, subject-independent validation, CNN model and Streamlit demo.

    Python

  3. sleepmind-ai sleepmind-ai Public

    Sleep product analytics and AI coaching platform with ML-based sleep quality prediction.

    Python

  4. psychiatric-brain-connectivity-analysis psychiatric-brain-connectivity-analysis Public

    Resting-state fMRI functional connectivity analysis across psychiatric diagnostic groups using the UCLA CNP dataset.

    Jupyter Notebook

  5. Sleep-Staging-Fragmentation-Detection Sleep-Staging-Fragmentation-Detection Public

    Exploratory sleep staging and fragmentation analysis from Sleep-EDF PSG data

    Jupyter Notebook