Hire the Best Statistical Modeling Professionals

Do you need accurate, actionable insights from your survey, research, or business data to make informed decisions through powerful statistical and data science analysis? Look no further! I am a top-rated and full-time research data analyst with >8 years of experience in IBM SPSS, R, Python, SAS, STATA, NVIVO, JMP, JASP, Atlas.ti, Excel/Google Sheets. As a statistics wiz, survey expert, and data science practitioner, my areas of expertise include: ⭐️ Questionnaire/survey design & validation ⭐️ Survey & research data analysis: descriptive, inferential (Chi-Square, regression, correlation, t-test, ANOVA, etc.), predictive modeling ⭐️ Detailed interpretation & storytelling of results ⭐️ Report writing, academic formatting (APA, Harvard), and publication-ready outputs ⭐️ Advanced automation & scripting for reproducible workflows I provide a variety of services including but not limited to: ★ Sample size calculations ★ Correlation, regression, & multivariate analysis ★ Hypothesis testing & statistical modeling ★ Factor analysis (EFA/CFA), structural equation modeling ★ Predictive analytics & data visualization ▶︎ and much more My specializations: Health Research & Predictive Analysis Master's/Ph.D. Thesis & Dissertation Modeling Company Survey & Performance Analytics Social, Economic & Behavioral Data Science Projects What clients say 👉👉👉 ☆☆☆☆☆ "She is always of great help, and the turnaround time is on point. I can depend on her for assistance and explaining the work thoroughly." "Great work. Amazing communication and delivered the project on time." "Esther's results were clear, organized, and thoroughly explained. Excellent work! I'm so impressed! I appreciate her efforts and insight to the analysis of the project!" ☆☆☆☆ ✍️ Feel free to get in touch, and we can discuss your project further

A dynamic Senior Biostatistician and Data Scientist seeks to bring an accomplished combination of education and experience to an industry-leading employer. 15+ years of experience in related data analysis, computer programming, and instruction roles for distinguished universities. Ph.D. in Biostatistics, with an M.S. in both Bio-Engineering and Applied Mathematics. Proficient in data management, mathematical modeling, grad/undergrad instruction, longitudinal/statistical analysis, project management, and more. Diligent and goal-oriented, with the skills, education, and hands-on experience needed to make an immediate impact as part of any fast-paced team.

Most AI freelancers build demos. I build systems that run in production — pipelines that handle real data volumes, agents that recover from failures, and architectures that your engineering team can actually maintain. My stack spans the full modern AI engineering spectrum: from stateful multi-agent orchestration with LangGraph and MCP, to production RAG systems built from scratch on Databricks, to the data engineering backbone (Spark Structured Streaming, Delta Lake, CDC) that makes all of it reliable at scale. What I Build: ~ Agentic AI Systems: Multi-agent pipelines using LangGraph — with stateful memory, conditional routing, Human-in-the-Loop approval gates, and MCP integration. Not simple chains. Systems that plan, execute, self-evaluate, and iterate. ~ RAG & Knowledge Systems: Custom retrieval pipelines (PDF parsing → chunking → embeddings → vector search) built without black-box wrappers. Adaptive routing that self-grades retrieval quality and falls back intelligently. Conversational memory across sessions. ~ Real-Time Data Pipelines: Fault-tolerant Databricks lakehouses using Medallion Architecture — Auto Loader, Spark Structured Streaming, CDC with MERGE deduplication, Unity Catalog governance, and Z-ORDER optimization across millions of records. ~ ML & Econometrics: When the problem needs statistical rigor, not just a model — causal inference, forecasting, bias/leakage checks, and calibration. Results that hold up under scrutiny, not just on a test set. Core Stack: LangGraph · LangChain · MCP · RAG Pipelines · Databricks · Apache Spark · Delta Lake · Python · FastAPI · Vector Databases · OpenAI / Anthropic APIs · MLflow · Azure · Power BI · Econometrics

Top Rates Plus - awarded to the top 3% of Upwork freelancers! Experienced Senior Statistical Programmer with over 8 years of expertise in clinical trials and pharmaceutical research across therapeutic areas including oncology, cardiology, dermatology, gastroenterology, neurology, hematology, Real World Evidence (RWE), peptides and vaccines studies. Strong leadership capabilities in coordinating programming activities and timelines across multiple studies in phases I-IV. Dedicated to maintaining data integrity and supporting efficient clinical trial operations. Proficient in the development of statistical computing environments and serving as a clinical trials subject matter expert (SME) for software development companies supporting clinical research solutions. For a detailed overview of my hands-on responsibilities and real-world contributions, please refer to the Employment section, which outlines how this expertise has been applied across clinical trial development and pharmaceutical research projects. I hold Bachelor of Data Science degree from the American University of Armenia. My educational background, combined with hands-on experience, has equipped me with a robust skill set and a deep understanding of statistical methodologies and programming languages relevant to the clinical trials domain. My technical skills include proficiency in: SAS Programming (Advanced Level Certified, see in the 'Certifications' section): • Advanced SAS/BASE, SAS, SQL, SAS/MACRO, SAS/GRAPH, SAS/STAT, SAS/PROC, ODS output • SAS Viya (cloud version), Integration with R and Python, SAS Visual Analytics • Arrays, Hash Objects, Advanced Indexing, Memory Management • Handling large and complex datasets with efficient I/O and parallel processing techniques • Advanced macro writing, debugging and dynamic code generation, nested and recursive macros • Git/version control tools R Programming: • Clinical packages - pharmaverse, admiral, sdtmoak, tfrmt, gtsummary, PKNCA • Data manipulation and transformation - tidyverse, dplyr, tidyr, purrr, stringr, lubridate, tibble (implicit), readr (implicit) • Data visualization - ggplot2, plotly, gtsummary (dual-purpose), gt, flextable, patchwork, cowplot • High-quality analytical reports - rmarkdown, knitr, quarto • Interactive dashboards and applications using R Shiny Python Programming: • Python core (data types, control flow, functions, modules), NumPy, pandas, SciPy. • Clinical data processing with pandas (joins, reshaping, group summaries, derivations comparable to SDTM/ADaM workflows). • Integration with SAS and R (reading/writing SAS datasets via pyreadstat, interoperability for QC and validation). • Data visualization and reporting (matplotlib, seaborn, Excel/CSV outputs, automated report generation). • Advanced data handling (vectorization, memory optimization, chunked processing, handling large datasets). • Statistical analysis in Python (descriptive statistics, hypothesis testing, regression, survival analysis using lifelines). • Validation and quality control frameworks (independent QC of SAS outputs, data consistency checks, audit-friendly logs). • Unit testing and code quality (pytest, structured logging, reproducible environments). • Metadata and XML processing (Define-XML handling, CDISC metadata validation using xml/lxml). Power BI & Business Intelligence: • Design and development of interactive Power BI dashboards for exploratory and operational analytics • Data modeling using Power BI semantic models, relationships, and star-schema concepts • Data transformation and preparation using Power Query (M language) • KPI development, filters, drill-downs, and slicers for executive-ready reporting • Integration with multiple data sources (CSV, Excel, SQL databases, APIs) • Performance optimization for large datasets (model size, relationships, DAX efficiency) • Secure sharing and collaboration using Power BI Service Project Management: Working with Jira, Scrum, GitHub Microsoft Office tools: Microsoft Word, Excel, PowerPoint, Access, Outlook Driven by a passion for continuous learning and a collaborative spirit, I am known for my easy-going demeanor and my ability to thrive in team environments within the clinical trials field. I approach each project with dedication and attention to detail, consistently delivering results that exceed expectations and contribute to the advancement of clinical research.

𝗜𝗳 𝘆𝗼𝘂𝗿 𝗻𝘂𝗺𝗯𝗲𝗿𝘀 𝗮𝗿𝗲𝗻'𝘁 𝗮𝗱𝗱𝗶𝗻𝗴 𝘂𝗽 𝗶𝗻 𝗘𝘅𝗰𝗲𝗹, 𝗶𝗻 𝘆𝗼𝘂𝗿 𝗺𝗼𝗱𝗲𝗹 𝗼𝗿 𝗶𝗻 𝘆𝗼𝘂𝗿 𝗿𝗲𝗽𝗼𝗿𝘁𝘀 𝗜'𝘃𝗲 𝗴𝗼𝘁 𝘆𝗼𝘂 𝗰𝗼𝘃𝗲𝗿𝗲𝗱. 💯 Ready to streamline your finances? Message me for a free consultation. Hey! I'm 𝗟𝘂𝗸𝗮, "𝙏𝙃𝙀 𝙁𝙄𝙉𝘼𝙉𝘾𝙄𝘼𝙇 𝙎𝙋𝙍𝙀𝘼𝘿𝙎𝙃𝙀𝙀𝙏 𝙂𝙐𝙔". I've helped 30+ clients across construction, retail, healthcare, manufacturing, education, real estate, and startups turn messy data and broken spreadsheets into clean financial models and automated dashboards. 100% Job Success Score. Top Rated. I respond within 30 minutes. 🔸English🔸Chinese🔸Russian🔸Georgian🔸 ⭐⭐⭐⭐⭐ "Luka was fantastic to work with from start to finish. Responsive, detail-oriented, and made sure everything matched my vision. Highly recommend." ⭐⭐⭐⭐⭐ "Great experience Luka's Excel knowledge was exactly what we needed. Delivered on time, every time." ⭐⭐⭐⭐⭐ "Luka took a complex financial sheet and made it simple, clean, and easy to use. Will hire again without question." 𝗪𝗵𝗮𝘁 𝗺𝗮𝗸𝗲𝘀 𝗺𝗲 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 𝗳𝗿𝗼𝗺 𝗲𝘃𝗲𝗿𝘆 𝗼𝘁𝗵𝗲𝗿 𝗘𝘅𝗰𝗲𝗹 𝗳𝗿𝗲𝗲𝗹𝗮𝗻𝗰𝗲𝗿? Most Excel freelancers build pretty spreadsheets. I build financial models that hold up in investor meetings, bank submissions, and board reviews because I come from finance. IFRS audit. FP&A. Accounting. I understand P&L, cash flow, and balance sheet at a level most spreadsheet guys simply don't. Your numbers will not just look good. They will be right. And if a lender, investor, or CFO questions them, they will hold up. 💡 𝗔𝗿𝗲𝗮𝘀 𝗼𝗳 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 ✔️ Financial Modeling & Projections ✔️ Excel & Google Sheets Formulas & Dashboards ✔️ Cash Flow Forecasting & Budgeting ✔️ FP&A Reporting & Variance Analysis ✔️ Data Analysis & Visualization ✔️ Data Cleaning & Structuring 🛠️ 𝗪𝗵𝗮𝘁 𝗜 𝗕𝘂𝗶𝗹𝗱 ✅ Investor-ready financial models full P&L, cash flow statement, balance sheet ✅ Real estate pro forma IRR, equity multiple, cash-on-cash, DSCR, cap rate, GP/LP waterfall ✅ Startup financial projections pre-seed, seed, Series A pitch deck ready ✅ SaaS financial models MRR, ARR, churn, LTV, CAC, burn rate, runway ✅ Three-statement financial models linked and fully dynamic ✅ Budget vs. actual tracker with variance analysis and FP&A dashboards ✅ 13-week cash flow forecasts bank-ready and lender-friendly ✅ SBA loan and bank-ready financial projection packages ✅ Nonprofit and grant budget models board-ready reporting ✅ DCF analysis, NPV modeling, and business valuation ✅ Scenario analysis, sensitivity analysis, and break-even models ✅ Advanced Excel formulas XLOOKUP, INDEX/MATCH, SUMPRODUCT, dynamic arrays ✅ Interactive dashboards Excel, Google Sheets, Power BI, Looker Studio ✅ KPI dashboards with Pivot Tables, slicers, and dynamic charts ✅ Google Sheets automation with Apps Script and timed triggers ✅ Power Query data transformation, cleaning, and automation ✅ Data migration between Google Sheets and Excel ✅ Data cleaning, deduplication, and CSV restructuring for database upload 🛠️ 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 & 𝗧𝗼𝗼𝗹𝘀 ✔️ 𝗠𝗶𝗰𝗿𝗼𝘀𝗼𝗳𝘁 𝟯𝟲𝟱: Excel · Power BI · Power Query · SharePoint · OneDrive ✔️ 𝗚𝗼𝗼𝗴𝗹𝗲 𝗪𝗼𝗿𝗸𝘀𝗽𝗮𝗰𝗲: Google Sheets · Apps Script · Looker Studio · Google Forms ✔️ 𝗙𝗶𝗻𝗮𝗻𝗰𝗶𝗮𝗹: IRR · NPV · DSCR · Cap Rate · DCF · Waterfall · Sensitivity Analysis ✔️ 𝗢𝘁𝗵𝗲𝗿: Airtable · MySQL · ChatGPT · Claude · Gemini 💯 𝗪𝗵𝘆 𝘀𝗵𝗼𝘂𝗹𝗱 𝘆𝗼𝘂 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 𝗺𝗲? ✔️ Finance background IFRS audit, FP&A, accounting. I understand P&L, cash flow, and balance sheet. Most Excel freelancers don't. ✔️ 100% Job Success Score on every single completed contract ✔️ Fast turnaround I respond within 30 minutes and deliver on time, every time ✔️ Clean, professional design that any non-technical user can navigate confidently ✔️ No jargon. No confusing tech-speak. Plain English explanations always included. ✔️ Long-term partnerships welcome I build systems you can own and maintain yourself 𝗖𝗼𝗺𝗺𝗼𝗻 𝗤𝘂𝗲𝘀𝘁𝗶𝗼𝗻𝘀 𝗜 𝗔𝗻𝘀𝘄𝗲𝗿 𝗗𝗮𝗶𝗹𝘆 • Should you use Google Sheets or Microsoft Excel for your business? • How do I build an investor-ready financial model from scratch? • What is the difference between a 3-statement model and a cash flow forecast? • Should I use Power BI or Looker Studio for my reporting dashboard? • How do I clean and restructure messy data for a database upload? • Excel for Mac OS vs. Windows are there compatibility issues? Excel help | Excel Expert | Excel formula | Excel Dashboard | Google Sheets Expert | Google Sheets Automation | Google Apps Script | Financial Modeling | Real Estate Financial Modeling | Pro Forma | Startup Financial Model | SaaS Financial Model | Cash Flow | FP&A | Budget vs Actual | Power BI | Looker Studio | IRR | DSCR | DCF | Waterfall | Scenario Analysis | Break-Even | Three-Statement Model | KPI Dashboard | XLOOKUP | Financial Projection | Financial Analysis | IFRS | Data Visualization

I. EDITING/WRITING, academic and technical II. QUANTITATIVE ANALYSIS in R & MS Excel III. TIPS FOR PROSPECTIVE CLIENTS I. EDITING/WRITING I combine graduate-level mathematical knowledge with excellent writing skills. Prior to earning a Ph.D. in Decision Sciences and an MBA, I was awarded graduate and undergraduate degrees in English literature and worked as an editor of technical materials. I specialize in academic writing/editing, particularly for quantitative subjects, and am a published author in peer-reviewed journals. I can and have edited many types of documents: policies and procedures, theses and dissertations (many for ESL students), white papers, reports, papers targeted at academic journals. Books I've edited that are currently for sale on Amazon include the following: Mike Barrett, "SAT Math 2 Prep Black Book" Phil Champagne, "The Book of Satoshi: The Collected Writings of Bitcoin Creator Satoshi Nakamoto" Mukesh Prasad, "From Light to Eternity" Ronald J. Ryan, "The U.S. Pension Crisis" Jon Warner, Business Optimization: A Simple and Effective Approach for Achieving Ongoing Business Success D. K. Willardson, "Quantitative Hitting: Surprising Discoveries of the Game’s Best Hitters" Anna Wozniak, "The Demon That Occupied Wall Street: How Social Thinkers Deceived Human Mind" My Editing Methodology: If you are seeking someone to edit your 30,000-word thesis in 2 hours for $40, please look elsewhere. A typical edit for me is as follows: 1) A paragraph-level read that usually proceeds at a rate of about 1,000 words/hour. Here I correct/modify grammar, spelling, and some formatting. This rate may be much lower for exacting editing such as papers targeted at academic journals and personal statements written in support of job applications. 2) A higher level reading to not only catch anything I missed in my first reading but also to check the document for flow, clarity, and internal consistency. 3) A spelling and grammar check through MS Word. 4) A final look for orphan headings or anything else that could have gone wrong. I am expert in MS Word and can style headings and tables, figures, and equations so that Word can generate a table of contents and lists of tables, figures, and equations, respectively. I can style headings according to a particular format (i.e., APA 7th ed.). For mathematical or statistical material, I can generate graphics through either R's basic plotting functions or the ggplot2 package or through MS Excel. I am an intermediate user of LaTeX (Overleaf) and rMarkdow A further service is reference citation and bibliography. I prefer to use a source-management software such as EndNote or Mendeley, which will generate a bibliography automatically. If you should have any questions concerning your particular document, please do not hesitate to ask. I offer small, complimentary sample edits. Lastly, I do not do homework or work for students, although I do provide advice within the limits of editing work--pointing out what I see as flaws or gaps in logic of a document I'm editing. Aside from its being academically dishonest, it places a great deal of responsibility on me. What if I were to do the work and then the work earned an F? I appreciate your understanding with respect to this. II. QUANTITATIVE ANALYSIS I am proficient in R and C++. I've had extensive classroom and work experience performing various types of quantitative analyses and currently use R and MS Excel for analysis. I'm particularly adept at logistic regression. III. TIPS FOR PROSPECTIVE CLIENTS 1. Upon payment of their monthly fee to Upwork, freelancers are given 100 connects with which to apply for jobs. In the past, jobs typically cost 3-5 connects to apply for. However, the cost in connects has been increasing over the last couple of years, and the latest I've seen is 31 connects! Based on this, a freelancer would only be able to apply for 3 jobs per month without purchasing additional connects. A job poster who charges, for instance, 31 connects for a job that will pay a fixed price of only $15 (of which the freelancer will only receive 85% or $12.75) may not get much attention, particularly from well-qualified freelancers. One possibility is to issue invitations to qualified freelancers, who will then pay nothing in connects to apply for your job. I konw that I am not applying for jobs I would have in the past because of their excessive cost. Therefore, you are missing out on qualified freelancers due to connect inflation. 2. Give complete details on your job--whether it's editing a fiction or nonfiction book, for instance. 3. If you are seeking to hire a new freelancer but have already hired someone that did not work out. your job description will show that you've hired someone. As a consequence, a freelancer may not risk spending connects to apply for your job, thinking it's already been filled. THEREFORE, MAKE CLEAR THAT YOU ARE SEEKING A NEW HIRE IN YOUR JOB DESCRIPTION.