Stella Marries | Data Analyst

About Me

I'm a data analyst passionate about extracting meaningful insights from complex datasets. With expertise in data collection, cleaning, and analysis, I transform raw information into powerful business intelligence that drives decision-making.

My analytical approach combines statistical methods with creative problem-solving to uncover patterns and trends that might otherwise remain hidden. I specialize in R, Python, SQL, data visualization, and have a growing interest in predictive modeling using machine learning techniques.

Skills

Experience

Education

Data Analysis
Advanced data exploration and statistical analysis
SQL
Complex queries, database optimization, and data extraction
Data Visualization
Tableau, Power BI, and custom visualizations
Programming
Python (Pandas, NumPy, Matplotlib, Scikit-learn)
Machine Learning
Predictive modeling and statistical forecasting

2024 July - Present
Research Intern at AMREC
2023 May - 2023 August
Data Analyst at Yemaachi Biotech

2019
Bachelor's in Biostatistics - Jomo Kenyatta University of Agriculture and Technology
Continuous
Professional development through specialized courses and certifications

My Skills

My technical toolkit

Data Collection & Management

Proficient in gathering data from various sources including databases, APIs, and surveys. Expert in designing data collection methodologies and implementing ETL processes.

SQL & Database

Advanced SQL querying capabilities across multiple database systems. Experience with complex joins, subqueries, window functions, and database optimization techniques.

Data Visualization

Creating impactful visualizations using Tableau, Power BI, Python and R libraries. Skilled in developing interactive dashboards that communicate insights effectively.

Predictive Analytics

Implementing machine learning models for forecasting and prediction. Experience with regression, classification, clustering, and time-series analysis.

Programming

Proficient in Python for data analysis using libraries like Pandas, NumPy, and Scikit-learn. Experience with R for statistical analysis and visualization.

Communication

Translating complex analytical findings into actionable insights for stakeholders. Creating clear reports and presentations that drive decision-making.

My Projects

Recent data analysis work

Retail Sales Analysis Dashboard

Developed an interactive dashboard analyzing sales trends across regions, identifying key growth opportunities that increased revenue by 15%.

Tools: Tableau, SQL, Excel

Customer Segmentation Model

Created a machine learning model to segment customers based on purchasing behavior, enabling targeted marketing campaigns with 30% higher engagement.

Tools: Python (Scikit-learn), SQL, Matplotlib

Predictive Maintenance System

Built a predictive model to forecast equipment failures, reducing downtime by 25% and maintenance costs by $300K annually.

Tools: Python, SQL, Time-series forecasting

Market Basket Analysis

Conducted association rule mining to discover product affinities, improving cross-sell recommendations that increased average order value by 12%.

Tools: R, SQL, Power BI

View More Projects

Certifications

Professional achievements

Microsoft Certified: Data Analyst Associate

January 2023

Validation of skills in preparing, modeling, visualizing, and analyzing data using Microsoft Power BI.

Google Data Analytics Professional Certificate

August 2022

Comprehensive training in data analysis, including SQL, R programming, and data visualization.

Tableau Desktop Specialist

March 2022

Certification demonstrating proficiency in Tableau Desktop for data visualization and analysis.

SQL Advanced Certification

October 2021

Mastery of advanced SQL concepts including complex joins, window functions, and query optimization.

Hi, I'm Stella Marries

Data Analyst