South America
Methodology for Comparing Machine Learning Algorithms for Survival Analysis
Cardoso, Lucas Buk, Angelo, Simone Aldrey, Bonilha, Yasmin Pacheco Gil, Maia, Fernando, Ribeiro, Adeylson Guimarães, Curado, Maria Paula, Fernandes, Gisele Aparecida, Parro, Vanderlei Cunha, Cipparrone, Flávio Almeida de Magalhães, Filho, Alexandre Dias Porto Chiavegatto, Filho, Victor Wünsch, Toporcov, Tatiana Natasha
This study presents a comparative methodological analysis of six machine learning models for survival analysis (MLSA). Using data from nearly 45,000 colorectal cancer patients in the Hospital-Based Cancer Registries of São Paulo, we evaluated Random Survival Forest (RSF), Gradient Boosting for Survival Analysis (GBSA), Survival SVM (SSVM), XGBoost-Cox (XGB-Cox), XGBoost-AFT (XGB-AFT), and LightGBM (LGBM), capable of predicting survival considering censored data. Hyperparameter optimization was performed with different samplers, and model performance was assessed using the Concordance Index (C-Index), C-Index IPCW, time-dependent AUC, and Integrated Brier Score (IBS). Survival curves produced by the models were compared with predictions from classification algorithms, and predictor interpretation was conducted using SHAP and permutation importance. XGB-AFT achieved the best performance (C-Index = 0.7618; IPCW = 0.7532), followed by GBSA and RSF. The results highlight the potential and applicability of MLSA to improve survival prediction and support decision making.
Hillsborough police report 'may not give answers'
Hillsborough police report'may not give answers' Families of some of those killed in the Hillsborough disaster fear they may once again be denied full accountability as the long-delayed report into police conduct surrounding the stadium crush is due to be published on Tuesday. Several people who worked on the Independent Office for Police Conduct (IOPC) investigation - including a former director - have told the BBC they doubt the report will deliver all the answers survivors and bereaved relatives were promised. Some have warned that it may lead to accusations of another Hillsborough cover-up. Families have also criticised the length and cost of the investigation - the largest of its kind ever carried out in England and Wales. The police watchdog has spent more than 13 years examining the actions of South Yorkshire Police and other forces in the aftermath of the 1989 disaster in which 97 Liverpool supporters were killed during an FA Cup semi-final at Sheffield Wednesday's Hillsborough ground.
The 110 very best Cyber Monday deals in the US, curated and vetted
These are products we believe are worth purchasing year-round - the discount is just a bonus. These are products we believe are worth purchasing year-round - the discount is just a bonus. Our experts found the best deals and sales that are actually worth your money. The Guardian's journalism is independent. We will earn a commission if you buy something through an affiliate link. The Guardian's journalism is independent. We will earn a commission if you buy something through an affiliate link. We all have holiday traditions we look forward to each year: cooking your grandmother's classic stuffing recipe. With the influx of these so-called "doorbuster deals", it can be hard to know a true steal from a modest markdown. So we've asked shopping experts to curate the best Black Friday and Cyber Monday sales across five of the most-shopped for categories. Whether you're looking for a much-needed sleep upgrade or a cordless vacuum that'll stand the test of time, below is our list of the best Cyber Monday deals across streaming, home, kitchen, tech, travel and wellness products. These are items that normally add up fast but right now are going for prices you won't wince at. To put together our list of deals, we enlisted the help of Guardian contributors with years of experience testing products ranging from blenders to vacuums. Our recommendations are based on items tested and loved by our contributors and staff.
How Ukraine turned into the world's drone testing lab
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Drone video shows devastation from floods in Indonesia's Sumatra
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