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Arthur Sa Ferreira

@arthursaferreira.bsky.social
9 followers 22 following 92 posts

Physical Therapist & Biomedical Engineer | #Rehabilitation #TraditionalMedicine #SignalProcessing #StatisticalComputing #rstats

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Arthur Sa Ferreira @arthursaferreira.bsky.social · 06/10/2026
NEW PREPRINT INTER-RATER AND INTRA-RATER RELIABILITY OF THE MODIFIED TARDIEU AND MRC SCALES IN CHILDREN WITH CEREBRAL PALSY. dx.doi.org/10.2139/ssrn...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 23/09/2026
DESEMPENHO DO ESTADO DO PARÁ NO ENEM ENTRE 2019 E 2021: ANÁLISES COM ÊNFASE EM CIÊNCIAS DA NATUREZA E SUAS TECNOLOGIAS RECIMA21. 2026;7(9):e799052 doi.org/10.47820/rec...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 08/09/2026
Influence of Minimalist Footwear on Intrinsic Foot Muscle Characteristics, Arch Integrity, and Foot Function: A Systematic Review Protocol doi.org/10.1016/j.aa...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 22/08/2026
Response to the letter regarding “Fatigue in long COVID: An exploratory pragmatic randomized trial of osteopathic care plus physical therapy versus physical therapy alone” doi.org/10.1016/j.ij...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 12/08/2026
I don’t think I’ve ever written a paper from top to bottom doi.org/10.1371/jour... @plosbiology.org
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 12/08/2026
Posture and postural balance in people aged 6-39 with asthma: a systematic review Version 1; peer review: awaiting peer review doi.org/10.12688/f10... f1000research.com/articles/15-... published by @f1000.com
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 07/08/2026
#Pain and injury prevalence and their associations with #psychosocial and #motivational factors in amateur beach #tennis players: a cross-sectional study doi.org/10.1007/s113...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 05/08/2026
Lima, M.A.B., Menezes, K., Xerez, D.R. et al.Intramedullary injection of polymerized laminin in acute traumatic spinal cord injury: a first-in-human pilot study. Spinal Cord (2026). doi.org/10.1038/s413... @springernature.com
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Frank Harrell @f2harrell.bsky.social · 27/07/2026
New blog article proposing a general statement of the fundamental question a standard RCT should answer and providing robust and powerful statistical methods to answer it: www.fharrell.com/post/rctmod/ #Statistics #StatsSky #EpiSky #clinicaltrial #rct #pharma @stephensenn.bsky.social
fharrell.com
Statistical Models Answer the Fundamental Clinical Question and Provide Clinical Trial Estimands – Statistical Thinking
Specific goals and estimation targets for randomized clinical trials have still not been well defined for general outcome variables. Proponents of causal inference calculus have claimed to define goal...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 14/07/2026
RESPONSE TO THE LETTER REGARDING "FATIGUE IN LONG COVID: AN EXPLORATORY PRAGMATIC RANDOMIZED TRIAL OF OSTEOPATHIC CARE PLUS PHYSICAL THERAPY VERSUS PHYSICAL THERAPY ALONE doi.org/10.1016/j.ij... #longcovid #physiotherapy
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 13/07/2026
Posturographic assessment of shoulder complex stability in swimmers during Upper-Quarter Y Balance Test: cross-sectional study in young athletes, regarding handedness Muscles, Ligaments and Tendons Journal, 16(2) doi.org/10.32098/mlt...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 13/07/2026
OBSERVATÓRIO: Uma plataforma que interconecta redes de informação sistemas.uft.edu.br/periodicos/i... doi.org/10.20873/uft...
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Frank Harrell @f2harrell.bsky.social · 19/06/2026
Indeed the primary causes of bad science come from within: academics are incentivized for quantity, not quality; for novelty, not reproducibility. Toss in poor #Statistics education (including measurement and experimental design) and you have a disaster.
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 17/06/2026
Association between #pain locus of control and #fall risk in older adults with chronic pain: community-based cross-sectional study doi.org/10.63231/259...
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Florian Naudet @floriannaudet.bsky.social · 02/06/2026
Super happy to have contributed to this super important and timely paper, "Using Routinely Collected Data for Research Purposes: Challenges and Mitigation Strategies", led by @sabinehoffmann11.bsky.social and just published in @bmj.com... www.bmj.com/content/393/...
bmj.com
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 30/05/2026
Ciência com R: Perguntas e respostas para pesquisadores e analistas de dados. ferreiraas.github.io/Ciencia-com-R/ doi: 10.5281/zenodo.8320232 #R #stats
ferreiraas.github.io
Ciência com R
Este livro responde a diversas questões relacionadas à análise estatística de dados, revisitando os principais conceitos e sugerindo métodos computacionais para os mais diversos delineamentos de estud...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 29/05/2026
Posturographic assessment of shoulder complex stability in swimmers during Upper-Quarter Y Balance Test: cross-sectional study in young athletes, regarding handedness www.ejcrim.com/index.php/ml... doi.org/10.32098/mlt...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 29/05/2026
Effect of #HIIT versus moderate-intensity continuous training (MICT) on insulin sensitivity in participants with #T2DM: A systematic review and meta-analysis of randomised controlled trials doi.org/10.12688/f10... @f1000.com
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 23/05/2026
I would genuinely appreciate reading a paper in which the authors openly conclude: “The applied study design and methodology were insufficient to adequately address the proposed aim.” We need to talk about failure in science www.nature.com/articles/d41... @nature.com
nature.com
We need to talk about failure in science
Failure is part and parcel of research, but discussing it sometimes seems to be taboo in science. It doesn’t need to be.
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 22/05/2026
Shoulder #pain and #disability predict clinical outcomes better than biomechanical and functional measures in young #swimmers: a prospective cohort study doi.org/10.33155/ram... Revista Andaluza de Medicina del Deporte
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 19/05/2026
Health locus of control and its relationship with #kinesiophobia, #disability, and prognosis in chronic low back #pain. Brazilian Journal of Pain, 9, e202670 doi.org/10.63231/259...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 18/05/2026
🆕 C5–C6 and thoracic spine mobilization with postural correction exercise compared with conventional therapy in patients with adhesive capsulitis: a two-group, parallel-arm, single-blinded, randomized clinical trial—study protocol. Trials 27, 378 (2026) doi.org/10.1186/s130...
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Richard Riley (R²) @richarddriley.bsky.social · 07/05/2026
part 3: continuous outcomes - pubmed.ncbi.nlm.nih.gov/41975494/ These papers extend our earlier (pmsampsize) work focusing on population-level stability when building a regression-based prediction model (and thus the n required is typically larger).
pubmed.ncbi.nlm.nih.gov
A decomposition of Fisher's information to inform sample size for developing or updating fair and precise clinical prediction models - part 3: continuous outcomes - PubMed
Our methodology provides a practical framework for examining required sample sizes when developing or updating prediction models with continuous outcomes, focusing on achieving precise and equitable p...
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Richard Riley (R²) @richarddriley.bsky.social · 07/05/2026
⭐ Now published: trilogy of articles proposing how to calculate the sample size for building a prediction model that targets precise & fair predictions at individual level. part 1: binary outcomes - pubmed.ncbi.nlm.nih.gov/40624575/ part 2: time-to-event outcomes - pubmed.ncbi.nlm.nih.gov/41402895/
lnkd.in
LinkedIn
This link will take you to a page that’s not on LinkedIn
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 07/05/2026
Uso da Inteligência Artificial na Academia doi.org/10.17605/OSF...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 06/05/2026
Immediate Effects of Self-Massage Compared to Static Stretching on Neuromuscular and Functional Performance of Physically Active Healthy Adults: A Crossover Study doi.org/10.1016/j.jo...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 04/05/2026
‘Seeing pain differently’: the impact of physiotherapists’ attitudes and treatment beliefs on postural assessment in neck pain – an eye-tracking study DOI: 10.2478/advrehab-2026-0002 reference-global.com/article/10.2... #pain #neckpain #msk #physiotherapy
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Wolfgang Viechtbauer @wviechtb.bsky.social · 27/04/2026
A new version (5.0-1) of the metafor package has been released on CRAN. It includes some smaller updates, including more ways to visualize prediction intervals / distributions. Further details here: www.metafor-project.org/doku.php/new... #Rstats #MetaAnalysis
A forest plot with various methods for visualizing the prediction interval / distribution at the bottom.
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Mark Rubin @markrubin.bsky.social · 27/04/2026
You can “do statistics wrong” at three levels: • Making errors in calculations within a formal system • Misunderstanding what could be concluded within the system if your small-world idealization held • Not realizing you have made a small-world idealization. By @meaningness.bsky.social #stats
metarationality.com
Statistics and the replication crisis | Meta-rationality
The mistaken belief that statistical methods can tell you what to believe drove the science replication crisis.
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Triad sou. @triadsou.bsky.social · 21/04/2026
Examining the Efficacy of Coarsened Exact Matching as an Alternative to Propensity Score Matching. Fei Wan. Statistics in Medicine. onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Examining the Efficacy of Coarsened Exact Matching as an Alternative to Propensity Score Matching
Coarsened exact matching (CEM) is often promoted as a superior alternative to propensity score matching (PSM) for addressing imbalance, model dependence, bias, and efficiency. However, this recommend...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 16/04/2026
C5–C6 and thoracic spine mobilization with postural correction exercise compared with conventional therapy in patients with adhesive capsulitis: a two-group, parallel-arm, single-blinded, randomized clinical trial—study protocol doi.org/10.1186/s130...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 12/04/2026
FATIGUE IN LONG COVID: AN EXPLORATORY PRAGMATIC RANDOMIZED TRIAL OF OSTEOPATHIC CARE PLUS PHYSICAL THERAPY VERSUS PHYSICAL THERAPY ALONE International Journal of Osteopathic Medicine doi.org/10.1016/j.ij...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 03/04/2026
Keeping the abdomen relaxed versus contracted during Pilates improves disability slightly and may improve other outcomes in chronic non-specific low back pain: a randomised trial doi.org/10.1016/j.jp...
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Darren Dahly @statsepi.bsky.social · 26/03/2025
So please, give me university leaders who can understand and effectively convey this message to government, and stop hiring wanna-be corporate CEOs who think we are selling widgets and subsidizing power-point training here.
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Darren Dahly @statsepi.bsky.social · 26/03/2025
Profit motives absolutely generate a great deal of societal value. However, the societal value of a university is completely rooted in the fact that they *aren't* profit driven. This is what allows universities to pursue new knowledge for the public good....
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Journal of Open Source Software @joss-openjournals.bsky.social · 27/03/2026
Just published in JOSS: 'chatAI4R: Interactive Artificial Intelligence toolkit for Data Science in R' doi.org/10.21105/joss.09283
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 27/03/2026
Our letter to the editor is out! Insights from Ungureanu et al.: interpreting AI-clinician disagreement in ECG diagnostics. Acta Cardiologica, 81(2), 247–249. doi.org/10.1080/0001...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 24/03/2026
The Relationship Between Psychological Factors and Postural Performance under Different Biofeedback Conditions. Appl Psychophysiol Biofeedback doi.org/10.1007/s104...
doi.org
The Relationship Between Psychological Factors and Postural Performance under Different Biofeedback Conditions - Applied Psychophysiology and Biofeedback
Applied Psychophysiology and Biofeedback - The postural biofeedback technique has been of potential interest to postural rehabilitation, as it promotes conscious postural control and reduces sway,...
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Darren Dahly @statsepi.bsky.social · 18/03/2026
Every day is a good day for sharing one of the most useful papers about research data ever written. PLEASE get your people to understand and follow this advice. www.tandfonline.com/doi/full/10....
Data Organization in Spreadsheets
Karl W. Broman
& Kara H. Woo
Pages 2-10 | Received 01 Jun 2017, Accepted author version posted online: 29 Sep 2017, Published online: 24 Apr 2018

    1. Introduction
    2. Be Consistent
    3. Choose Good Names for Things
    4. Write Dates as YYYY-MM-DD
    5. No Empty Cells
    6. Put Just One Thing in a Cell
    7. Make it a Rectangle
    8. Create a Data Dictionary
    9. No Calculations in the Raw Data Files
    10. Do Not Use Font Color or Highlighting as Data
    11. Make Backups
    12. Use Data Validation to Avoid Errors
    13. Save the Data in Plain Text Files

ABSTRACT

Spreadsheets are widely used software tools for data entry, storage, analysis, and visualization. Focusing on the data entry and storage aspects, this article offers practical recommendations for organizing spreadsheet data to reduce errors and ease later analyses. The basic principles are: be consistent, write dates like YYYY-MM-DD, do not leave any cells empty, put just one thing in a cell, organize the data as a single rectangle (with subjects as rows and variables as columns, and with a single header row), create a data dictionary, do not include calculations in the raw data files, do not use font color or highlighting as data, choose good names for things, make backups, use data validation to avoid data entry errors, and save the data in plain text files.
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Stephen Senn @stephensenn.bsky.social · 14/03/2026
It used to be that only at most three or maybe four people read a PhD. The author, the supervisor, the examiner(s). Nowadays even the “author” might not have read it.
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Darren Dahly @statsepi.bsky.social · 11/03/2026
Inject straight into my veins please. www.annualreviews.org/content/jour...
annualreviews.org
The Enemies of Reliable and Useful Clinical Prediction Models: A Review of Statistical and Scientific Challenges
The current status of applied clinical prediction modeling is poor. Many models are developed with suboptimal methods and are not evaluated, and hence have little impact on clinical care. We review 12...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 02/03/2026
#Reprint Symmetry Application in Motor Control in Sports and Rehabilitation doi.org/10.3390/book... #rehabilitation #symmetry #motorcontrol #sports
doi.org
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Journal of Clinical Epidemiology @jclinepi.bsky.social · 28/02/2026
Crossing the null does not mean “no effect”: a survey of internal medicine physicians on the interpretation of effect estimates with wide confidence intervals - Journal of Clinical Epidemiology www.jclinepi.com/article/S089...
jclinepi.com
Crossing the null does not mean “no effect”: a survey of internal medicine physicians on the interpretation of effect estimates with wide confidence intervals
Results with confidence intervals (CIs) crossing the null should not be interpreted as indicating no effect. We assessed how often clinicians make this error and explored predictors of correct interpr...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 23/02/2026
** New Preprint** Functional Status and Rehabilitation Barriers in Adults of Working Age After Stroke: A Cross-Sectional Study doi.org/10.21203/rs.... #preprint #stroke #rehabilitation
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 17/02/2026
Engaging citizen science: Exploring popular participation in scientific projects in rehabilitation Aging Medicine and Healthcare 17(1):p 53-58, Jan–Mar 2026 doi.org/10.4103/AMAH... #citizenscience #reabilitation #cienciacidada #reabilitacao
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 12/02/2026
Insights from Ungureanu et al.: interpreting AI-clinician disagreement in ECG diagnostics www.tandfonline.com/doi/full/10.... #ecg #AI
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 09/02/2026
Read this #preprint: Validation of SAUDE: A Citizen Science App for Functional Balance Assessment in Older Adults dx.doi.org/10.21203/rs.... #citizenscience #balance #falls
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Triad sou. @triadsou.bsky.social · 06/02/2026
An Empirical Assessment of the Cost of Dichotomization of the Outcome of Clinical Trials. Erik W. van Zwet, Frank E. Harrell Jr, Stephen J. Senn. Statistics in Medicine. onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
An Empirical Assessment of the Cost of Dichotomization of the Outcome of Clinical Trials
We have studied 21 435 unique randomized controlled trials (RCTs) from the Cochrane Database of Systematic Reviews (CDSR). Of these trials, 7224 (34%) have a continuous (numerical) outcome and 14 211...
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 05/02/2026
Explainable machine learning reveals key predictors of ICU mortality in COVID-19: functional outcomes and physiotherapy interventions in cardiovascular patients doi.org/10.47066/296... #ICU #COVID #COVIDー19 #physiotherapy #ML
doi.org
Explainable machine learning reveals key predictors of ICU mortality in COVID-19: functional outcomes and physiotherapy interventions in cardiovascular patients
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Arthur Sa Ferreira @arthursaferreira.bsky.social · 30/01/2026
Effects of differing nutritional supplementation combined with high-intensity aerobic interval training on functional exercise capacity, cardiac function, and quality of life in patients with heart failure and reduced ejection fraction: a randomized trial doi.org/10.1097/PHM....
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