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Rafael Izbicki

@rafael-izbicki

Assistant Professor at UFSCar | @CMU_Stats PhD | Statistics | Machine Learning | Data Science | @CNPq_Oficial Research Fellow | Dad https://rafaelizbicki.com/

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30.08.2024
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Latest posts by Rafael Izbicki @rafael-izbicki

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โœจ We kicked off a new season of talks, the AI FUN with ELLIS Invited Speaker Lecture series, brought to you by the Centre for AI FUNdamentals and the #ELLIS Unit at Manchester ๐Ÿ

The 1๏ธโƒฃst talk was given by our guest speaker Rafael Izbicki (@rafael-izbicki.bsky.social) from UFSCar in Brazil ๐Ÿ‡ง๐Ÿ‡ท

04.09.2025 09:45 ๐Ÿ‘ 2 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Dengue nowcasting in Brazil by combining official surveillance data and Google Trends information Author summary Dengue is a mosquito-borne viral disease that poses significant public health challenges in tropical and sub-tropical regions worldwide. Surveillance systems are crucial for dengue prev...

๐ŸฆŸ Our new paper is out in PLOS Neglected Tropical Diseases! We use Google Trends + surveillance data to improve nowcasting of dengue in Brazil.

W/ the great Y. Xiao, G. Soares, L. Bastos & P. Moraga.

๐Ÿ”— journals.plos.org/plosntds/art...
Online Tracker: diseasesurveillance.github.io/dengue-track...

20.08.2025 12:24 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Interested in uncertainty quantification methods such as conformal prediction, Gaussian processes and conditional density estimators?

You can now get a physical copy of my book on Amazon!

amazon.com/Machine-Lear...

#MachineLearning #UncertaintyQuantification #AI #DataScience #ConformalPrediction

07.08.2025 11:35 ๐Ÿ‘ 0 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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๐Ÿ“ข New on Medium: My Paper Was Outdated Before It Was Published

Submitted. Waited. Rejected. Revised. Accepted.
By then, 50+ citations and 1k GitHub stars. The field had moved on.

Thoughts on fixing peer review in fast-moving fields:

๐Ÿ”— rizbicki.medium.com/my-paper-was...

#PeerReview

06.08.2025 23:39 ๐Ÿ‘ 4 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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On Focusing Statistical Power for Searches and Measurements in Particle Physics Particle physics experiments rely on the (generalised) likelihood ratio test (LRT) for searches and measurements, which consist of composite hypothesis tests. However, this test is not guaranteed to b...

What if you could beat the Likelihood Ratio Test?

A fun and potentially transformational phy-statistics paper with Ann Lee, James Carzon, @rafael-izbicki.bsky.social, luca Masserano and @danielwhiteson.bsky.social
arxiv.org/abs/2507.17831

28.07.2025 07:01 ๐Ÿ‘ 5 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Big newsโ€”our paper was accepted for oral presentation at #UAI2025! ๐Ÿฅณ

We (me + Vagner S. Santos, Thiago R Ramos, @rafael-izbicki.bsky.social ) built EPICSCORE, a method to improve conformal prediction intervals by adding epistemic uncertainty awareness.

Hereโ€™s why it matters ๐Ÿงต

07.05.2025 15:23 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Interesed in uncertainty quantification methods such as conformal prediction, Gaussian processes, and conditional density estimators?

You can now get a physical copy of my book on Amazon!

๐Ÿ“– amazon.com/Machine-Lear...

#MachineLearning #UncertaintyQuantification #AI

14.02.2025 23:34 ๐Ÿ‘ 6 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Interesed in uncertainty quantification methods such as conformal prediction, Gaussian processes, and conditional density estimators?

You can now get a physical copy of my book on Amazon!

๐Ÿ“– amazon.com/Machine-Lear...

#MachineLearning #UncertaintyQuantification #AI

14.02.2025 23:34 ๐Ÿ‘ 6 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Aparentemente esse ano serรก um caos em Sรฃo Paulo em relaรงรฃo ร  dengue novamente.

Mais estimativas em diseasesurveillance.github.io/dengue-track...

#dengue #epi #epidemiology

22.01.2025 00:58 ๐Ÿ‘ 5 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

No, it doesn't work. For multiclass you need to direcly change the loss function (see e.g. Eq 2.3 of rafaelizbicki.com/UQ4ML.pdf)

21.01.2025 12:55 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Livro - Machine Learning Learning Beyond Point Predictions: Uncertainty Quantification | Rafael Izbicki (UFSCar) | PhD โ—๏ธ If you live outside Brazil, access the book webpage by clicking here. ๐Ÿ“˜ Adquira a versรฃo impressa, disponรญvel em dois formatos: ๐Ÿ“™ Colorida: clique aqui. ๐Ÿ“— Preto e branco: clique aqui.

[Se vocรช estรก no Brasil, acesse rafaelizbicki.com/UQ4MLpt ]

20.01.2025 13:12 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Topics include conditional density estimation, Gaussian processes, conformal prediction, and calibration techniques.

Download for free or buy printed version

๐Ÿ”—http://rafaelizbicki.com/UQ4ML

#MachineLearning #UncertaintyQuantification #DataScience #AI #PredictiveAnalytics

20.01.2025 13:12 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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๐Ÿ•ฎ New Book Release! ๐Ÿ˜€

Happy to share my new book, Machine Learning Beyond Point Predictions: Uncertainty Quantification.

Tools to tackle aleatoric & epistemic uncertainties in AI. +

20.01.2025 13:12 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

ร‰ absurdo como muitos dos divulgadores cientรญficos simplesmente pararam de cobrar vacinas quando o novo governo assumiu.

Estamos faz meses tentando dar uma dose de vacina de covid para minha filha, mas estรก sempre em falta. Idem para idosos.

18.12.2024 12:28 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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๐Ÿ“œ Check it out: sciencedirect.com/science/arti...

#ClimateScience #UncertaintyQuantification #DataScience

17.12.2024 16:00 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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๐ŸŒณ New paper! Led by Denis Valle, we present a nonparametric approach to quantify uncertainty in multistep upscaling models. We illustrate our methods for forest biomass predictions in the Brazilian Amazon. +

#RemoteSensing #MachineLearning #ForestBiomass

17.12.2024 16:00 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Decision regions based on a significance level alpha and a threshold epsilon for the gender wage gap data presented in the paper. For higher values of alpha and lower values of epsilon, the hypothesis is rejected. For lower values of alpha and higher values of epsilon, the hypothesis is not rejected.

Decision regions based on a significance level alpha and a threshold epsilon for the gender wage gap data presented in the paper. For higher values of alpha and lower values of epsilon, the hypothesis is rejected. For lower values of alpha and higher values of epsilon, the hypothesis is not rejected.

I am happy to announce that a paper of mine, Rafael B. Stern and @rafael-izbicki.bsky.social has been accepted for publication at the International Journal of Approximate Reasoning ๐ŸŽ‰

In our paper, we show how to build and test hypotheses of practical equivalence in nonparametric settings. ๐Ÿงต

09.12.2024 15:38 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 1
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We demonstrate the capabilities of LF2I in a ๐ก๐ข๐ ๐ก-๐ž๐ง๐ž๐ซ๐ ๐ฒ ๐ฉ๐ก๐ฒ๐ฌ๐ข๐œ๐ฌ ๐š๐ฉ๐ฉ๐ฅ๐ข๐œ๐š๐ญ๐ข๐จ๐ง, addressing challenges involving intractable likelihoods and high-dimensional datasets.โฃ
โฃ
๐Ÿ“„ Read the full article here: lnkd.in/dxRgHZep
โฃ
#Statistics #MachineLearning #DataScience

04.12.2024 14:10 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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In this work, we introduce ๐‹๐…๐Ÿ๐ˆ, a modular framework that combines tools from classical statistics and machine learning to construct confidence sets for problems where statistical models are given by ๐œ๐จ๐ฆ๐ฉ๐ฅ๐ž๐ฑ ๐Ÿ๐จ๐ซ๐ฐ๐š๐ซ๐ ๐ฌ๐ข๐ฆ๐ฎ๐ฅ๐š๐ญ๐จ๐ซ๐ฌ (LFI) +โฃ

04.12.2024 14:10 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Excited to announce our new publication!

Our paper, "Likelihood-free frequentist inference: bridging classical statistics and machine learning for reliable simulator-based inference," is now in EJS!

Co-authored with the great N Dalmasso, @lucamasse95
, D Zhao, and A B Lee. +

04.12.2024 14:10 ๐Ÿ‘ 0 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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No dia 25/11, eu, Thiago Rodrigo Ramos e Luben Miguel Cruz Cabezas daremos uma sรฉrie de seminรกrios no Programa de Pรณs-Graduaรงรฃo do Dept. de Ginecologia e Obstetrรญcia da FMRP USP. Mais informaรงรตes: lnkd.in/dps4mHDU

22.10.2024 15:38 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Stop oversampling! Changing the cutoff in probabilistic classifiers is enough for imbalanced data.
In our new paper, Gabriel O. Assunรงรฃo, Marcos O. Prates, and I explore this in depth. jds-online.org/journal/JDS/...
#DataScience #MachineLearning #ImbalancedData #AI #Oversampling

16.10.2024 16:25 ๐Ÿ‘ 8 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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๐Ÿ“ข Tarde Temรกtica: Inferรชncia, Redes e IA no dia 25/10 no CINA-UFSCar!

Palestras com @franciscorodrigues.bsky.social (ICMC-USP), Pedro L. C. Rodrigues (Inria) e Heloรญsa Camargo (DC-UFSCar).

Saiba mais: rafaelizbicki.com/tematico_ia/

#InteligenciaArtificial #Redes #Simulaรงรฃo #DataScience

10.10.2024 11:09 ๐Ÿ‘ 3 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Tambรฉm estou com a sensaรงรฃo de fim do mundo

03.10.2024 23:16 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Tรก insuportรกvel isso aqui. O mais triste รฉ que passaram a semana dizendo que hoje ia esfriar um monte.

02.10.2024 13:44 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Ran my text through ChatGPT arguing why oversampling usually doesnโ€™t make sense, and it flipped my argument to support oversampling instead. A reminder that AI often defaults to consensusโ€”even when it's wrong. Always double-check!

#AI #MachineLearning #Statistics

21.09.2024 11:38 ๐Ÿ‘ 7 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Does not exist

17.09.2024 21:05 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Estรฃo abertas as inscriรงรตes para o Concurso Pรบblico para Professor Efetivo no Depto de Estatรญstica da UFSCar! Inscriรงรตes atรฉ 11/10/2024

Sรฃo Carlos รฉ um polo de inovaรงรฃo e pesquisa, com excelente qualidade de vida. + info: concursos.ufscar.br

#concurso #estatistica #datascience #machinelearning

16.09.2024 23:47 ๐Ÿ‘ 4 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Adoro esse livro!

14.09.2024 12:03 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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O PIPGEs (UFSCar/USP) estรก com inscriรงรตes abertas para mestrado (atรฉ 21/10) e doutorado (atรฉ 14/10). Bolsas disponรญveis e oportunidades de tutoria e monitoria. Linhas de pesquisa: Machine Learning, Inferรชncia, Probabilidade e Modelos de Regressรฃo. + info: tinyurl.com/pipges2024 #posgrad

12.09.2024 16:51 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0