3 results on '"area under receiver operating characteristics"'
Search Results
2. Geospatial modelling of mineral potential zones using data-driven based weighting factor and statistical index techniques.
- Author
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Amponsah, Prince Ofori and Forson, Eric Dominic
- Subjects
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GEOGRAPHIC information systems , *STATISTICAL weighting , *RECEIVER operating characteristic curves , *MINERALS , *GOLD mining , *FIELD research , *ORE deposits - Abstract
Mineral prospectivity models (MPMs) are significantly essential in delineating target zones with the optimum likelihood of containing a particular sought-after mineral deposit. This present study carried out mineral potential mapping over the Collette Prospecting Licence (PL) Area of north-western Ghana using bivariate data-driven spatial statistical models composed of statistical index (SI) and weighting factor (WF) approaches. In the first instance, the geographic coordinates of variously known locations of artisanal mining operations as well as high Au concentration locations were mapped during a field survey. As a result, 181 known locations of Au occurrences were identified, out of which 127 (70%) were selected randomly for training and creating the mineral prospectivity models, whereas the remaining 54 (30%) were used to assess and validate the accuracy of the predictive models produced. The efficacy of mineral prospectivity models generated enormously depends on the appropriate selection of mineral-related factors. In this study, the following mineral-related condition factors (evidential layers) comprising analytic signal, lineament density, uranium-thorium ratio, uranium, potassium-thorium ratio, potassium, reduction-to-equator, and geology were used. The aforementioned evidential layers were derived and sourced from geophysical and geological datasets, which were later prepared for the generation of the models in a geographic information systems (GIS) environment. Finally, the validation of the mineral prospectivity models generated was carried out by applying the receiver operating characteristics (ROC) curve. The estimated results based on the ROC plots obtained for the predictive models showed that the area under the ROC curve (AUC) scores obtained for the SI-based and WF-based mineral prospectivity models were respectively, 0.780 and 0.733. Hence, it can be concluded that both mineral predictive models created in this study produced reasonably good accuracy (AUC score greater than 0.7) in predicting the potential zones of gold mineralisation occurrences within the Collette PL Area of north-western Ghana. These MPMs can serve as essential models for mineral exploration programmes within the study area. • Gold mineralisation prospect of the Collette tenement in NW Ghana. • Mineral prospectivity modelling using the statistical index and the weighting factor techniques. • Model validation score using receiver operating characteristics curve. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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3. acNASH index to diagnose nonalcoholic steatohepatitis: a prospective derivation and global validation study
- Author
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Mohamed El Kassas, Manuel Romero-Gómez, Wah-Kheong Chan, Zhi-Ming Huang, Kenneth I. Zheng, Yusuf Yilmaz, Christopher D. Byrne, Ming-Hua Zheng, Xi-Xi Wu, Giovanni Targher, Jérôme Boursier, Hémodynamique, Interaction Fibrose et Invasivité tumorales Hépatiques (HIFIH), Université d'Angers (UA), Centro de Investigación Biomédica en Red en el Área temática de Enfermedades Hepáticas y Digestivas (CIBERehd), Liver Unit, Clínica Universitaria, CIBER-EHD, Helwan University [Caire], University of Verona (UNIVR), National Natural Science Foundation of China, Public Health Department of Zhejiang Province, Wu, Xi-Xi, Zheng, Kenneth, I, Boursier, Jerome, Chan, Wah-Kheong, Yilmaz, Yusuf, Romero-Gomez, Manuel, El Kassas, Mohamed, Targher, Giovanni, Byrne, Christopher D., Huang, Zhi-Ming, and Zheng, Ming-Hua
- Subjects
nonalcoholic fatty liver disease ,Metabolic dysfunction-associated fatty liver disease ,Medicine (General) ,Prospective Epidemic Research Specifically Of NASH ,ALT ,type 2 diabetes mellitus ,0302 clinical medicine ,aspartate aminotransferase ,HBV ,FIBROSIS ,Medicine ,GAA ,negative predictive value ,ComputingMilieux_MISCELLANEOUS ,0303 health sciences ,CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration ,AUROC ,NAS, NAFLD Activity Score ,URINARY CREATININE ,NASH ,ASSOCIATION ,General Medicine ,HBV, chronic viral hepatitis B ,Primary care ,3. Good health ,CRN ,NPV, negative predictive value ,HCV ,030211 gastroenterology & hepatology ,NASH, nonalcoholic steatohepatitis ,medicine.medical_specialty ,Renal function ,T2DM ,digestive system ,NPV ,03 medical and health sciences ,R5-920 ,NAFLD ,metabolic dysfunction-associated fatty liver disease ,metabolic dysfunction-associated fatty liver ,screening ,nutritional and metabolic diseases ,scoring system ,T2DM, type 2 diabetes mellitus ,medicine.disease ,sensitivity ,digestive system diseases ,Clinical Research Network ,NAS ,chronic viral hepatitis C ,HCV, chronic viral hepatitis C ,chronic viral hepatitis B ,NAFLD, nonalcoholic fatty liver disease ,area under receiver operating characteristics ,Body mass index ,Sp ,estimated glomerular filtration rate ,BMI, body mass index ,[SDV]Life Sciences [q-bio] ,CKD-EPI ,specificity ,AST, aspartate aminotransferase ,CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration ,GAA, guanidine-acetic acid ,Nonalcoholic fatty liver disease ,MUSCLE MASS ,SCr ,Se, sensitivity ,PERSONS, Prospective Epidemic Research Specifically Of NASH ,guanidine-acetic acid ,Screening ,Biomarker (medicine) ,Se ,Research Paper ,CRN, Clinical Research Network ,alanine aminotransferase ,Epidemiology  ,body mass index ,PPV ,NAFLD Activity Score ,serum creatinine ,e-GFR ,BMI ,primary care ,Diabetes mellitus ,Internal medicine ,ALT, alanine aminotransferase ,PERSONS ,SCr, serum creatinine ,Nonalcoholic steatohepatitis ,AST ,FATTY LIVER-DISEASE ,030304 developmental biology ,e-GFR, estimated glomerular filtration rate ,disease ,Receiver operating characteristic ,business.industry ,Hepatology ,Collaboration ,BIOMARKER PANEL ,PPV, positive predictive value ,MODEL ,Chronic Kidney Disease  ,AUROC, area under receiver operating characteristics ,positive predictive value ,Sp, specificity ,Steatosis ,business - Abstract
[Background] There is an unmet need for non-invasive biomarkers for the diagnosis of nonalcoholic steatohepatitis (NASH) in non-specialized settings. We aimed to develop and validate a non-invasive test for diagnosing NASH in individuals with biopsy-proven nonalcoholic fatty liver disease (NAFLD)., [Methods] We developed a non-invasive test named the acNASH index that combines serum creatinine and aspartate aminotransferase levels in a derivation cohort of 390 Chinese NAFLD patients admitted to the hepatology center of the First Affiliated Hospital of Wenzhou Medical University (China) between December 2016 and September 2019 and subsequently validated in five external cohorts of different ethnicities of patients with biopsy-confirmed NAFLD (pooled n=1,089)., [Findings] The performance of the acNASH index for identifying NASH (defined as NAFLD activity score ≥5 with score of ≥1 for each steatosis, lobular inflammation and ballooning) was good in the derivation cohort with an area under receiver operating characteristics (AUROC) of 0·818 (95%CI 0·777-0·860). A cutoff of acNASH index 7·73 gave a Sp of 91%, Se of 53% and a positive predictive value (PPV) of 85% for ruling-in NASH. In the pooled validation cohort (n=1,089), the diagnostic performance of the index was also good with AUROC=0·805 (95%CI 0·780-0·830), NPV of 93% for ruling-out NASH and PPV of 73% for ruling-in NASH. Subgroup analyses showed similar performance in patients with diabetes or subjects with normal serum transaminase levels., [Interpretation] The acNASH index shows promising utility as a simple non-invasive biomarker for diagnosing NASH among adults with biopsy-proven NAFLD of different ethnicities from different countries., The National Natural Science Foundation of China (82070588), High Level Creative Talents from Department of Public Health in Zhejiang Province (S2032102600032) and Project of New Century 551 Talent Nurturing in Wenzhou.
- Published
- 2021
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