Nirwan Ilyas
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View article: Corrigendum to “Spatial autoregressive quantile regression modeling of gross regional domestic product data in Java Island” [MethodsX 15 (2025) 103621]
Corrigendum to “Spatial autoregressive quantile regression modeling of gross regional domestic product data in Java Island” [MethodsX 15 (2025) 103621] Open
[This corrects the article DOI: 10.1016/j.mex.2025.103621.].
View article: Spatial autoregressive quantile regression modeling of gross regional domestic product data in Java Island
Spatial autoregressive quantile regression modeling of gross regional domestic product data in Java Island Open
This study analyzes the Gross Regional Domestic Product (GRDP) data of Java Island to understand the region's economic conditions and the key factors influencing GRDP. Java Island contributes the largest share to the national GRDP; however…
View article: Improved Liu estimator for the beta regression model: Methods, simulation and applications
Improved Liu estimator for the beta regression model: Methods, simulation and applications Open
Inspired by a real-life manufacturing problem, we present a mathematical model and a heuristic that solves it. A desired solution needs not only to maximize the company’s profit but must also be easy to interpret by the members of the mana…
View article: Data Balancing Approach Using Combine Sampling on Sentiment Analysis With K-Nearest Neighbor
Data Balancing Approach Using Combine Sampling on Sentiment Analysis With K-Nearest Neighbor Open
One of the topics that has been discussed on twitter is the rules regarding the removal of masks. However, there's a chance that the data from Twitter contains unequal data classes. An unequal amount of data can cause the classification pr…
View article: Mengatasi Overdispersi Menggunakan Regresi Binomial Negatif dengan Penaksir Maksimum Likelihood pada Kasus Demam Berdarah di Kota Makassar
Mengatasi Overdispersi Menggunakan Regresi Binomial Negatif dengan Penaksir Maksimum Likelihood pada Kasus Demam Berdarah di Kota Makassar Open
The basic assumption in Poisson regression is that the mean value is the same as the variance value, which is called equidispersion. However, in some cases, this assumption is not met. A variance value that is greater than the average is c…
View article: Robust Spatial-Temporal Analysis of Toddler Pneumonia Cases and its Influencing Factors
Robust Spatial-Temporal Analysis of Toddler Pneumonia Cases and its Influencing Factors Open
Pneumonia is a disease that causes inflammation of the lungs and is one of the most common diseases infecting toddlers. As a directly infectious disease, there is a possibility of the influence of location diversity on the number of pneumo…
View article: Comparison of Negative Binomial Regression Model and Geographically Weighted Poisson Regression on Infant Mortality Rate in South Sulawesi Province
Comparison of Negative Binomial Regression Model and Geographically Weighted Poisson Regression on Infant Mortality Rate in South Sulawesi Province Open
The number of infant mortality cases is an important indicator to assess the quality of a country's public health. A number of studies argue that the case of infant mortality has a close relation to the living area condition and the social…
View article: Regresi Model Data Panel Efek Tetap dengan Metode Within Group pada Data Indeks Pembangunan Manusia Provinsi Sulawesi Selatan
Regresi Model Data Panel Efek Tetap dengan Metode Within Group pada Data Indeks Pembangunan Manusia Provinsi Sulawesi Selatan Open
This research aims to describe the parameter estimation of the regression model on the panel data by approaches of Fixed Effects Model with within a group method. This research aims to determine the factors that influence the Human Develop…
View article: Likelihood Construction of Hawkes Process in Insurance Claim Settlement Process
Likelihood Construction of Hawkes Process in Insurance Claim Settlement Process Open
The construction of the likelihood equation in the point process models plays a very important role, especially to obtain a good estimator of the parameters of a model. This paper aims to construction of the likelihood of Hawkes process in…
View article: A class of variable coefficient elliptic equations solved using BEM
A class of variable coefficient elliptic equations solved using BEM Open
In this paper a BEM is used to solve a class of variable coefficient elliptic equations numerically. Some examples are considered to show the convergence, consistency, and accuracy of the numerical solutions.
View article: Boundary value problems governed by Helmholtz equation for anisotropic trigonometrically graded materials: A boundary element method solution
Boundary value problems governed by Helmholtz equation for anisotropic trigonometrically graded materials: A boundary element method solution Open
Trigonometrically graded media of anisotropic diffusion coefficient are under consideration. Boundary value problems (BVPs) of such kind of media, governed by a Helmholtz type equation, are solved numerically using a boundary element metho…
View article: Numerical simulation of modified Helmholtz boundary value problems for anisotropic exponentially graded materials
Numerical simulation of modified Helmholtz boundary value problems for anisotropic exponentially graded materials Open
In this paper we consider the modified Helmholtz type equation governing interior two-dimensional boundary value problems (BVPs) for anisotropic functionally graded materials (FGMs) with Dirichlet and Neumann boundary conditions. Persisten…
View article: A boundary element method solution to spatially variable coefficients diffusion convection equation of anisotropic media
A boundary element method solution to spatially variable coefficients diffusion convection equation of anisotropic media Open
The diffusion-convection equation with variable coefficients and for anisotropic media which were previously considered by other authors are discussed again in this paper to find their numerical solutions by using the boundary element meth…
View article: A boundary element method with analytical integration for deformation of inhomogeneous elastic materials
A boundary element method with analytical integration for deformation of inhomogeneous elastic materials Open
This paper is concerned with obtaining solutions to the equation governing static deformations of inhomogeneous elastic materials. The material parameters are assumed to vary continuously with the spatial variables. A boundary element meth…