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Henry Otoo

Publications (8)

Robust Inference and Management Prioritisation of Sub-Basin Water-Quality Heterogeneity in the Pra River Basin, Ghana

Frank B. K. Twenefour, Henry Otoo & Eric Neebo Wiah · Asian Journal of Geographical Research · 2026

Aims: River-basin averages may conceal management-relevant differences among tributary systems. This study quantified the magnitude, precision, and management relevance of differences in Water Quality Index (WQI) among the Birim, Offin, and Pra sub-basins of the Pra River Basin,...

Open access Research Article 10.9734/ajgr/2026/v9i4460

Spatial Trend and Geostatistical Prediction of Water Quality Index in the Pra River Basin of Ghana

Frank B. K. Twenefour, Henry Otoo, Eric Neebo Wiah & Emmanuel Ayitey · International Journal of Environment and Climate Change · 2026

Reliable spatial prediction of river water quality is essential in mining-affected river basins where pollution varies across space. This article examined the spatial behaviour of the Water Quality Index (WQI) in the Pra River Basin system of Ghana and compared the performance of...

Open access Research Article 10.9734/ijecc/2026/v16i75528

A Hybrid Optimization Model for Vehicle Routing Problem, a Case Study at Zoomlion Ghana Limited, Shama District

Justice Kangah, Henry Otoo & Joseph Acquah · Asian Research Journal of Mathematics · 2022

The aim of this study was to develop a hybrid optimization model for solving the routing problem identified at Zoomlion Ghana Limited in Shama district in the Western Region of Ghana. Two main optimization models were considered: Particle Swarm Optimization (PSO) and Genetic Algo...

Open access Research Article 10.9734/arjom/2022/v18i1130432

Kumaraswamy-Janardan Distribution: A Generalized Janardan Distribution with Application to Real Data

Nelson Doe Dzivor, Henry Otoo & Eric Neebo Wiah · Asian Journal of Probability and Statistics · 2021

The quest to improve on flexibility of probability distributions motivated this research. Four-parameter Janardan generalized distribution known as Kumaraswamy-Janardan distribution is proposed through method of parameterization and studied. The probability density function, cumu...

Open access Research Article 10.9734/ajpas/2021/v15i430368

Testing the Proportional Hazards Assumption before Cox Model Application: A Three-test Sequential Protocol with Empirical Validation in a Ghanaian Prostate Cancer Cohort

Emmanuel Asare Ayim, Benjamin Odoi & Henry Otoo · Journal of Cancer and Tumor International · 2026

Background: Prostate cancer remains a leading cause of cancer mortality among men in Ghana and across sub-Saharan Africa, with many patients presenting at advanced disease stages where survival outcomes are influenced by disease progression, treatment failure, comorbidities, and...

Open access Research Article 10.9734/jcti/2026/v16i3369

A Hybrid Extended Cox-frailty and Random Forest Framework for Prostate Cancer Survival: Integrating Clinical Interpretability with Machine Learning Performance

Emmanuel Asare Ayim, Benjamin Odoi & Henry Otoo · Journal of Cancer and Tumor International · 2026

Prostate cancer risk stratification in low-resource clinical settings requires survival-prediction tools that address violations of the proportional hazards assumption, unobserved patient heterogeneity, and nonlinear covariate interactions that classical regression frameworks can...

Open access Research Article 10.9734/jcti/2026/v16i3367

A Comparison of Geospatial Interpolation Techniques for Gold Anomalies in Wassa - Amenfi District, Southwest Ghana

Emmanuel Ayitey, Christiana Nyarko, Henry Otoo, Micheal Affam & Peter Kwesi Nyarko · Asian Journal of Geological Research · 2022

In spatial interpolation, the Inverse-Distance Weight (IDW) and Kriging methods are two of the most widely used deterministic and geostatistical models. In deterministic techniques, interpolation is performed using mathematical functions, whereas geostatistics uses statistical an...

Open access Research Article

Extreme Value Theory Modeling of Geochemical Anomalies: Block Maxima Approach

Emmanuel Ayitey, Christiana C. Nyarko, Henry Otoo & Micheal Affam · Asian Journal of Probability and Statistics · 2022

Mineral shortages can be avoided if the mineral industry accurately predicts mineral deposits, which is critical given the importance of minerals in Ghana's economy. The goal of this dissertation was to use the block maxima (BM) approach of Extreme Value Theory (EVT) to accuratel...

Open access Research Article 10.9734/ajpas/2022/v17i230421