r
rafreis

Rafael R PhD

@rafreis
4,9(295)

Top Rated

Data is the new oil!

Brasile
Inglese
Alcune informazioni sono riportate in lingua inglese.
Chi sono
Hi, I’m Rafael—a data scientist, researcher and professor with 10+ years of experience turning complex data into clear insights. I hold a PhD from the University of Leeds and have partnered with researchers, NGOs and businesses to solve real-world challenges using R, SPSS and Python, from statistical modelling and machine learning to experimental design. As author of 16 peer-reviewed papers, I guarantee methodological rigor, reproducibility and actionable results. Let’s connect and drive your project forward!... Continua a leggere

Competenze

r
rafreis
Rafael R PhD
50 USD/ora
offline • 
Tempo di risposta medio: 1 ora

Consulta i miei servizi

Modello statistico e analisi
I will perform statistical data analysis with spss, r, or python
4,9(269)
Machine learning
I will build and evaluate a machine learning model in python or r

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50 USD

/

ora

Portfolio

Esperienza lavorativa

Unlisted

Part time • 4 yrs 5 mos

Professor of Data Science

Aug 2022 - Dec 20231 yr 4 mos

Company: Sirius Education Taught data science and quantitative methods remotely — statistics, R/Python and applied analytics.

Data Scientist

Mar 2020 - Apr 20233 yrs 1 mo

Company: SENAI (National Service for Industrial Training) Built COVID-19 case-forecasting models powering a public-health decision dashboard (Monitora-Covid19). Designed a survey and a predictive infection-risk model to optimize PCR testing via risk-based sample pooling, reducing reagent use on low-probability cases. Delivered analytics and visualizations to support data-driven public-health decisions.

Doctoral Researcher (PhD)

Leeds • Full time

May 2016 - Dec 20193 yrs 7 mos

Company: Leeds Institute for Data Analytics PhD research on behaviour change and sustainable mobility (EMPOWER, EU Horizon 2020). Designed and analyzed a large-scale survey (920 respondents), applied behavioural-science theory (Theory of Planned Behaviour, Norm-Activation Model) and psychographic segmentation (cluster + discriminant analysis), and modeled determinants of travel behaviour. Published peer-reviewed work; conducted thesis analytics within the Leeds Institute for Data Analytics (LIDA).

295 Recensioni
4,9

(276)
(15)
(2)
(2)
(0)
Valutazione dettagliata
  • Livello di comunicazione del venditore
    5
  • Qualità della consegna
    4,9
  • Valore della consegna
    4,8
1-5 di 295 recensioni
Ordina per
Più rilevante
    G

    giacomo901

    FI

    Finlandia

    Collaborazione in corso
    5

    The statistical data analysis was conducted successfully and produced clear, reliable results. The data was carefully organized and analyzed using appropriate statistical methods, allowing meaningful patterns and trends to be identified. The findings supported the objectives of the study and were presented...

    Utile?
    No
    A
    image-docs

    achievingskills

    US

    Stati Uniti

    5

    I had a very positive experience working with Rafael on a methodological review of our grant Letter of Inquiry. His professionalism was evident throughout the entire process—communication was clear, expectations were well-defined, and he approached the work with a high level of integrity and respect...

    Utile?
    No
    I

    infiniteincorp

    US

    Stati Uniti

    Collaborazione in corso
    5

    Rafael was exceptional to work with. He thoroughly reviewed our exercise physiology research study, verified our linear mixed-effects models in R, checked our statistical assumptions, and helped ensure every analysis was both rigorous and reproducible. He caught important details, explained his reasoning...

    Utile?
    No
    H

    halima_alhabib

    SA

    Arabia Saudita

    5

    Rafael delivered agency-level statistical analysis! He expertly navigated complex data structures for my master's thesis, applied the exact models my methodology required, and wrote up the results beautifully in strict APA 7th format. Fast delivery, excellent communication, and outstanding technical skill. I cannot recommend him enough!

    Utile?
    No
    S

    sarahnasser99

    AE

    Emirati Arabi Uniti

    5

    amazing ! very professional , highly skilled and has a deep understanding of the topics to deliver high standard services . he is also fast to respond and committed to deliver on the agreed date of delivery . thank you

    Utile?
    No