Nathaniel Howard

University of Cape Coast | UCC · Department of Statistics

Pragmatic national fire outbreak intervention planning requires intelligent data generative models capable of integrating the varied benefits of decentralization underlying the data generation processes. This paper focuses on developing realistic national fire outbreak data generative models based on regional data generation processes with region-s...

The scope for generating high-rank transmuted distributions has expanded beyond the cubic to achieve improved performance in baseline distributions such as those of the Gamma type. This paper develops a Quartic Rank Transmutation Distribution (QRTD), a new family of transmuted distributions with enhanced flexibility for modelling complex data probl...

This paper considered a robust method for modeling and predicting HIV/AIDS status of patients using logistic regression model enhanced with principal component analysis (PCA) and K-medians. In particular, the study developed a computational method for disease classification; and then identified key haematological predictors of HIV/AIDS status. Base...

The quest for unified solution for handling multicollinearity and autocorrelation jointly has resulted in a great deal of interest in two-stage approaches within the linear modelling paradigm recently. This paper contributes to this growing interest with Two-Stage Ridge Quantile Regression (TRQR) and Two-Stage Lasso Quantile Regression (TLQR) metho...

This paper sort to establish some risk factors of stroke and to estimate the effect of the covariates at different levels of disease states. A review of the literature on stroke risk factors did not reveal any article that estimate possible covariate effect of transition. To fill this gap, we incorporate the covariates in a Continuous Time Markov M...

Abstract We obtained secondary data from the medical unit of the Tamale Teaching Hospital in which stroke patients were on rehabilitation. The purpose of the study is to develop an illness-to-death model that will enable us to observe the transition rates of patients during rehabilitation at some discrete points in time. A review of literature on...

Physiological vital signs acquired during traumatic events are informative on the dynamics of the trauma and their relationship with other features such as sample-specific covariates. Non-time dependent covariates may introduce extra challenges in the Gaussian Process (GP) regression, as their main predictors are functions of time. In this regard,...

Physiological vital signs acquired during traumatic events are informative on the dynamics of the trauma and its relationship with other features such as sample-specific covariates. Non-time dependent covariates may introduce extra challenges in the Gaussian process (GP) regression, as its main predictors are functions of time. In this regard, the...

We propose a new stepwise confidence set procedure for toxicity study based on ratio of mean difference. Statistical approaches for evaluating toxicity studies that properly control familywise error rate (FWER) for difference of means between treatments and a control already exist. However, in some therapeutic areas, ratio of mean differences is de...

Complaints of heightened risks in the sub-Saharan African equities markets are rife in the practitioner literature. Investors need an understanding of the volatility dynamics in these frontier markets. This paper uses the Hidden Markov Models to detect the points of regime changes in the volatility in the markets of Ghana, Kenya, Nigeria and Botswa...

Valuing constitutes an important aspect of mathematics pedagogy and hence student learning outcomes. This study surveyed 416 students from Cape Coast, Ghana to explore what senior high school students in this country in West Africa valued in their study of mathematics. The data collected were analyzed using principal component analysis. The results...

We adopt a granular approach to estimating the risk of equity returns in sub-Saharan African frontier equity markets under the assumption that, returns are influenced by developments in the underlying economy. Four countries were studied – Botswana, Ghana, Kenya and Nigeria. We found heterogeneity in the evolution of volatility across these markets...

The paper addresses the issue of identifying the maximum safe dose in the context of noninferiority trials where several doses of toxicological compounds exist. Statistical methodology for identifying the maximum safe dose is available for three-arm noninferiority designs with only one experimental drug treatment. Extension of this methodology for...

The study investigates the effects of response scales of items on results of multivariate techniques. A total of sixty-four datasets have been simulated under various conditions such as item response format, number of dimensions underlying response scales, and sample size using R package mirt command: simdata(a, d, N, itemtype). Two main statistica...

The Minimum Description Length (MDL), a less known criterion, is making great strides in model selection as compared to the widely known and used information criteria (AIC, BIC, etc). This study developed the MDL criterion using R-functions to evaluate Asymmetric Price Transmission (APT) models (Complex, Standard and Houck’s) for the first time eve...

Abstract: In this paper, we propose a measure for detecting influential outliers in linear regression analysis. The performance of the proposed method, called the Coefficient of Determination Ratio (CDR), is then compared with some standard measures of influence, namely: Cook’s distance, studentised deleted residuals, leverage values, covariance ra...

The paper obtains models for determining age at first marriage (AFM) among Ghanaians in urban southern Ghana. Logistic regression models are developed for determining marriage under various circumstances and socio-economic changes that are necessitated by marriage. It also determines distributions that fit AFM and intended age of marriage (IAM) amo...

This book is based on university level courses in probability theory which the authors have taught for nearly 20 years at University of Cape Coast and some Technical Universities in Ghana. It is, therefore, intended to be a textbook on probability and probability distributions for tertiary level education. It is intended to be used in a two-semeste...