r
rafreis

Rafael R

@rafreis
4.9(241)

Top Rated

Data is the new oil!

Brazil
English
About me
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!... Read more

Skills

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rafreis
Rafael R
Offline • 
Offers hourly rates
Average response time: 3 hours

Portfolio

241 Reviews
4.9

(223)
(14)
(2)
(2)
(0)
Rating Breakdown
  • Seller communication level
    4.9
  • Quality of delivery
    4.9
  • Value of delivery
    4.8
1-5 out of 241 Reviews
Sort By
Most relevant
    N

    natalia1341

    PL

    Poland

    5

    This was the best collaboration on this portal. Rafael has incredible knowledge, is very helpful, and answers very quickly the questions. He helped me with my R code and checked the formulations in my paper in a very short time. His answers are always competent and on point. The next time I want...

    $1,000-$1,500

    Price

    2 days

    Duration

    Helpful?
    Yes
    No
    D

    dane458

    ZA

    South Africa

    4.3

    Working with Rafael on my MBA dissertation was the best decision I made. He was more than a data scientist; he was a true research partner who elevated the quality and rigor of my entire project. His expertise, professionalism, and commitment to academic integrity were exceptional. Rafael transformed...

    $600-$800

    Price

    6 days

    Duration

    gig

    Statistical Modeling & Analytics

    Helpful?
    Yes
    No
    R
    image-docs

    ryan_parke_32

    GB

    United Kingdom

    5

    Rafael checked a chapter of a manuscript for statistical accuracy. Before he began, he clarified exactly what it was that I needed. He reviewed every stage of my workings and produced a detailed report to verify which aspects of the charts were faithful to the sources, and which amendments would improve...

    $200-$400

    Price

    5 days

    Duration

    gig

    Statistical Modeling & Analytics

    Helpful?
    Yes
    No
    G

    ginlogicband

    Repeat Client

    GB

    United Kingdom

    5

    Always a pleasure to work with this guy.

    $200-$400

    Price

    6 days

    Duration

    gig

    Statistical Modeling & Analytics

    Helpful?
    Yes
    No
    K

    karinbendror

    IL

    Israel

    5

    Great collaboration — professional, reliable, and easy to communicate with. Looking forward to working together again.

    $600-$800

    Price

    3 weeks

    Duration

    gig

    Statistical Modeling & Analytics

    Helpful?
    Yes
    No