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Hire Dr. Tomasz R.

Poland

USD 70 /hr

Statistician & Data Analyst | Expert in R & SPSS | 2500+ Research Projects | Psychometrics, Methodology, APA

Profile Summary

I am a freelance statistician and data analyst with over 15 years of experience in academic research, psychometrics, and statistical consulting. As a co-founder of SocialMath and an academic lecturer, I have supported over 2500 research and commercial projects in psychology, medicine, education, and the social sciences. My expertise includes GLM, SEM/CFA, PCA/EFA, survey data, machine learning, and the development and validation of psychological measurement tools. I work primarily in R and SPSS, with deep knowledge of APA reporting standards and statistical methodology. Open to freelance collaborations in academic or applied research.

Subject Matter Expertise

• ★ Statistics
• ☆ Data Analysis
• ☆ Computer Simulation/Computational Modeling
• ☆ Human Behavior & Psychology
• ☆ Academic Testing
• ☆ SPSS
• ☆ R

Services

• Writing
• Research
• Data & AI

Writing Medical Writing, Non-Medical Regulatory Writing, Technical Writing, General Proofreading & Editing

Research User Research, Meta-Research, Feasibility Study, Technology Scouting, Fact Checking

Data & AI Predictive Modeling, Statistical Analysis, Image Processing, Image Analysis, Algorithm Design-Non ML, Algorithm Design-ML, Data Visualization, Big Data Analytics, Text Mining & Analytics, Data Mining, Data Cleaning, Data Processing, Data Insights

Work Experience

Uniwersytet Papieski Jana Pawla II w Krakowie

- Present

Academic Researcher

The Pontifical University of John Paul II in Krakow

October 2021 - Present

CTO, Senior S/W Engineer

SocialMath

December 2013 - Present

Education

Masters of Science

USWPS

January 2006 - January 2011

Certifications

• Certification details not provided.

Publications

JOURNAL ARTICLE

Tomasz Rak, Weronika Trzmielewska, Jakub Duras, Aleksandra Juchacz (2025). Examining the Impact of Control Condition Design in Mimicry–Liking Link Research: How Motor Behavior May Impact Liking . Roczniki Psychologiczne.

Rak, T., & Wrześniowski, S. (2023). Alfa Cronbacha–co daje dobre wyniki? Kilka uwag dotyczących budowania kwestionariuszy psychologicznych. Przegląd Psychologiczny, 66(4), 67-84 .

Rak, T., & Wrześniowski, S. (2023). Cronbach’s alpha-what makes it really good? Some advice for planning and criticizing psychological questionnaires. Przegląd Psychologiczny, 66(4), 151-167 .

{(:Unav)}(2022). Does Hope in Mind Influence People’s Problem-Solving Performance? . Polish Psychological Bulletin. Committee for Psychological Science PAS

Tomasz Rak, Szymon Wrześniowski, Weronika Trzmielewska (2022). Does Hope in Mind Influence People’s Problem-Solving Performance? . Polish Psychological Bulletin.

Motivation of cancer patients to help others and the relation between posttraumatic growth and helping @article{2019, doi = {10.5114/cipp.2019.86231}, url = {https://doi.org/10.5114%2Fcipp.2019.86231}, year = 2019, publisher = {Termedia Sp. z.o.o.}, volume = {7}, number = {3}, pages = {232--241}, author = {Weronika Trzmielewska and Mariusz Zi{\k{e}}ba and Marta Boczkowska and Tomasz Rak and Szymon Wrze{\'{s}}niowski}, title = {Motivation of cancer patients to help others and the relation between posttraumatic growth and helping}} . Current Issues in Personality Psychology.

The Internet Changed Chess Rules: Queen Is Equal to Pawn. How Social Media Influence Opinion Spreading @article{2018, doi = {10.32872/spb.v13i4.25660}, url = {https://doi.org/10.32872%2Fspb.v13i4.25660}, year = 2018, month = {dec}, publisher = {Leibniz Institute for Psychology ({ZPID})}, volume = {13}, number = {4}, author = {Tomasz Rak and Wojciech Kulesza and Nina Chrobot}, title = {The Internet Changed Chess Rules: Queen Is Equal to Pawn. How Social Media Influence Opinion Spreading}} . Social Psychological Bulletin.