r
rafreis

Rafael R PhD

@rafreis
4,9(297)

Top Rated

Data is the new oil!

Brésil
Anglais
Certaines informations sont présentées en anglais.
À propos de moi
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!... Plus d’infos

Compétences

r
rafreis
Rafael R PhD
50 $US/heure
hors ligne • 
Temps de réponse moyen de 2 heures

Voir mes services

Modélisation et analyse statistique
I will perform statistical data analysis with spss, r, or python
4,9(271)
Machine learning
I will build and evaluate a machine learning model in python or r

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Portfolio

Expérience professionnelle

Unlisted

Temps partiel • 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 • Temps plein

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).

297 Avis
4,9

(277)
(16)
(2)
(2)
(0)
Détails de la notation
  • Niveau de communication avec le freelance
    5
  • Qualité de la livraison
    4,9
  • Valeur de la livraison
    4,8
1 à 5 avis sur 297
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Les plus pertinents
    A
    image-docs

    achievingskills

    US

    États-Unis

    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...

    100 $US-200 $US

    Prix

    3 jours

    Durée

    gig

    Modélisation et analyse statistique

    Utile?
    Oui
    Non
    I

    infiniteincorp

    US

    États-Unis

    Collaboration en cours
    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...

    200 $US-400 $US

    Prix

    3 jours

    Durée

    gig

    Modélisation et analyse statistique

    Utile?
    Oui
    Non
    S

    sarahnasser99

    AE

    Émirats Arabes Unis

    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

    100 $US-200 $US

    Prix

    4 jours

    Durée

    gig

    Modélisation et analyse statistique

    Utile?
    Oui
    Non
    G

    giacomo901

    FI

    Finlande

    Collaboration en cours
    5

    Rafael was highly responsive and detail-oriented throughout the process. He addressed all comments thoroughly, provided clear explanations for each correction, and ensured full consistency across the analysis and documentation. His proactive approach and attention to detail made the collaboration smooth and efficient.

    100 $US-200 $US

    Prix

    6 jours

    Durée

    gig

    Modélisation et analyse statistique

    Utile?
    Oui
    Non
    J

    joabe_barbosa

    US

    États-Unis

    5

    Rafa is incredible! Fully recommend him, he is excellent at what he does! He helped me, answered questions and made me understand exactly what he did. He uses jargon, but explains exactly what he means and he guides you through everything so well!

    400 $US-600 $US

    Prix

    3 jours

    Durée

    gig

    Modélisation et analyse statistique

    Utile?
    Oui
    Non