Erin Williams

Freelance Data Science & Analysis Professional

Freelance Data Scientist Erin Williams in front of a vending machine in Tokyo

Hire Me For

Intelligent Analysis

Intelligent analysis is about asking the right questions, not just crunching numbers. I specialize in analysis that sees beyond the data: recognizing patterns across contexts and connecting dots that aren’t labeled, balancing raw curiosity with a clear sense of purpose, keeping the big picture in focus while attending to nuance. This kind of interpretive, context-aware thinking (which is still beyond the reach of AI) is at the heart of everything I do.

Data Science Expertise Enhanced with Business Experience & Domain Knowledge

I bring deep technical fluency shaped by years of cross-sector experience. My work is grounded in business acumen and domain-specific insight, allowing me to tailor data science approaches to real-world constraints and strategic goals. I don’t just apply algorithms; I adapt them to context, translating complexity into clarity.

Innovative Data Modeling

I develop custom data models that reflect the nuance of human systems. Whether forecasting trends or simulating scenarios, I build structures that reveal underlying dynamics and support strategic foresight. My work goes beyond surface metrics to uncover meaning, challenge assumptions, and illuminate what matters most.

Statistical Analysis & Methodology Design

I design robust methodologies, selecting appropriate statistical tests, models, and techniques, and interpreting results with care. Each approach reflects both mathematical constraints and the specific context of the application. I translate technical findings into meaningful conclusions for researchers, teams, and decision-makers.

Survey Design & Analysis

I create custom surveys grounded in best practices and informed by extensive practical experience. Questions and response options are meticulously crafted to elicit accurate, reliable, and useful information. Survey content and flow are designed with analysis in mind, so that all the information that is gathered can be efficiently analyzed and results can be meaningfully interpreted and communicated.

See Full List of Services

Project Examples

  • Lung Cancer Second-Line Treatment Decision Model

    Devised a pilot treatment decision model for non-small cell lung cancer patients requiring second-line treatment.

  • Novel Employee Engagement Analytical Model & Survey

    Designed a novel work engagement survey and analytical model based on a synthesis of three employee engagement theories from academic literature.

  • Customer-Facing Real Estate Ranking Algorithm, Survey, and App

    Developed a customer-facing survey and corresponding ranking algorithm and app to select and rank real estate properties in Mexico City based on weighted customer preferences.

  • NIBRS Crime Data Query Tool App

    Parsed and packaged millions of NIBRS data records; created a Shiny App for user-friendly data access and research purposes.

  • Retail Customer Segmentation Analysis & Targeted Strategy Recommendations

    Deep-dived into historical data for a long-standing retailer in New Zealand transitioning to online sales while continuing to mail out physical catalogues at significant cost.

  • Diagnostic Audit & Update Plan for Custom Builder's Revenue Forecast Model

    Executed a diagnostic audit and review of a monthly revenue forecast model used by a custom builder in Australia that tended towards over-estimating revenues in the near term.

  • Multi-Scenario Financial Forecast for Biotech Company

    Refactored, refined, and expanded a multi-scenario, 20-year financial forecasting model for a burgeoning biotech company developing RNA-based vaccines and therapies.

  • SEM Based Classification Models for Product Usage

    Created a suite of exploratory structural equation models (SEM) using data from a large-scale consumer survey focused on personal care products sold by a major multinational corporation.

Testimonials

  • Best freelancer I’ve ever worked with, and I’ve worked with hundreds. Very careful, smart, hard-working, and just an all-around rockstar.

    Biotech Company Financial Forecast Model, 2016

  • From a skill standpoint, Erin is unparalleled. Her keen intellect and expertise have been a tremendous asset to our team.

    Tech-forward Real Estate Company Algorithm Development, 2018-2023

  • Erin was able to interpret our objectives and translate that into work streams that generated actionable outputs all along the way that helped achieve our overarching goal of finding ways to optimize the catalogue business. To deliver this, it required a level of strategic critical thinking that went well beyond just analysis and that Erin possesses with great strength.

    Online/Retail Business - Customer and Purchase Analysis, 2019

  • Erin was a terrific partner on a very complex project. . . Her analytic, communication skills and overall quality of work was outstanding.

    Patient Cost Analysis Project, 2017-2018

  • Outstanding quality, domain expertise and communications

    Health Survey Sampling Strata, 2019

  • Erin did a fantastic job building a in-depth survey and analyzing the results. The results presentation was extremely helpful. She was very professional and timely. I highly recommend you work with her. We will work with her in the future.

    Customer Survey Design, Analysis & Presentation, 2024

  • I very much enjoyed working with Erin. Her communication skills were great. . . . The end result was a tool that did exactly what I wanted it to do and will help my research immensely. I look forward to hiring her again on a future project and can't recommend her highly enough!

    Shiny App Development for US Crime Statistics Research, 2025

  • Erin demonstrated exceptional skills in data science and quickly developed working models for us to experiment with. She is very easy to work with, and came with practical suggestions to build on our internal concepts. Strong recommendation for data science expert support.

    Automated Forecast Modeling Consultation, 2025

Erin Williams, Freelance Data Scientist, Photo by M. Luna

About Me

With over 18 years of experience in data science and analysis, I’ve established a proven track record of applying technical expertise, broad domain knowledge, and analytical depth towards helping clients solve problems, make smart decisions, and uncover meaningful insights about people, systems, and organizations. My work has spanned a diverse range of sectors and industries including healthcare, pharma, biotech, real estate, management consulting, retail, restaurants, e-commerce, and more. I’ve also partnered with clients in academia and government, conducted data science training seminars, and developed educational materials covering topics within data analysis, business intelligence, statistics, mathematics, and AI.

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