Zobrazeno 1 - 10
of 185
pro vyhledávání: '"Ahmed Z. Afify"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-16 (2024)
Abstract In survey statistics, estimating and reducing population variation is crucial. These variations can occur in any sampling design, including stratified random sampling, where stratum weights may increase the variance of estimators. Calibratio
Externí odkaz:
https://doaj.org/article/199fc98970fa4ddf8c70a761f50e0081
Autor:
Mohamed A.S. Ishag, Anthony Wanjoya, Aggrey Adem, Rehab Alsultan, Abdulaziz S. Alghamdi, Ahmed Z. Afify
Publikováno v:
Alexandria Engineering Journal, Vol 104, Iss , Pp 587-602 (2024)
The proportional hazard regression models are widely used statistical tools for analyzing survival data and estimating the effects of covariates on survival times. It is assumed that the effects of the covariates are constant across the time. In this
Externí odkaz:
https://doaj.org/article/39f40f38d01248d69d8a1997eb6ab871
Autor:
Veronica Kariuki, Anthony Wanjoya, Oscar Ngesa, Amirah Saeed Alharthi, Hassan M. Aljohani, Ahmed Z. Afify
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-34 (2024)
Abstract This paper presents the exponentiated alpha-power log-logistic (EAPLL) distribution, which extends the log-logistic distribution. The EAPLL distribution emphasizes its suitability for survival data modeling by providing analytical simplicity
Externí odkaz:
https://doaj.org/article/d3a772fca9c14b7aa5d073c68d057099
Autor:
Veronica Kariuki, Anthony Wanjoya, Oscar Ngesa, Mahmoud M. Mansour, Enayat M. Abd Elrazik, Ahmed Z. Afify
Publikováno v:
AIMS Mathematics, Vol 9, Iss 6, Pp 15610-15638 (2024)
In this paper, we propose a parametric accelerated failure time (AFT) hazard-based regression model with the extended alpha-power exponential (EAPE) baseline distribution. The proposed model is called the extended alpha-power exponential-AFT (EAPE-AF
Externí odkaz:
https://doaj.org/article/227b0989ab20417286e3d06c9f578ed9
Publikováno v:
AIMS Mathematics, Vol 9, Iss 5, Pp 11910-11940 (2024)
We introduced a flexible class of continuous distributions called the generalized Kavya-Manoharan-G (GKM-G) family. The GKM-G family extended the Kavya-Manoharan class and provided greater flexibility to the baseline models. The special sub-models of
Externí odkaz:
https://doaj.org/article/160c679f52794fb982de61cf9896cb69
Publikováno v:
Heliyon, Vol 10, Iss 6, Pp e27661- (2024)
The exponential distribution is one of the most widely used statistical distribution for reliability issues. In this paper, we introduce a novel family based on the exponential model, called the new exponential-H (NEx-H) family. The sub-models of the
Externí odkaz:
https://doaj.org/article/0cccb15bd1dc4ddfbfd0d143c1feaa9a
Autor:
Caner Tanış, Mahmoud M. Mansour, Enayat M. Abd Elrazik, Christophe Chesneau, Hazem Al-Mofleh, Ahmed Z. Afify
Publikováno v:
Journal of Mathematics, Vol 2024 (2024)
In this study, we propose a new zero-inflated regression model as an alternative to zero-inflated regression models, such as the zero-inflated Poisson, zero-inflated negative binomial, zero-inflated hurdle-Poisson, and zero-inflated hurdle negative b
Externí odkaz:
https://doaj.org/article/03c90607578c49048bec32c4b684a519
Autor:
Abdulaziz S. Alghamdi, Muhammad Ahsan-ul-Haq, Ayesha Babar, Hassan M. Aljohani, Ahmed Z. Afify
Publikováno v:
AIMS Mathematics, Vol 7, Iss 5, Pp 8344-8360 (2022)
In this article, a new two-parameter discrete power-Ailamujia (DsPA) distribution is derived using the survival discretization technique. Some key distributional properties and reliability measures are explored in closed forms, such as probability ge
Externí odkaz:
https://doaj.org/article/a00c09467d6a43d683e8c98a37896c55
Publikováno v:
AIMS Mathematics, Vol 7, Iss 1, Pp 225-246 (2022)
In this paper, a flexible version of the Fréchet distribution called the extended Weibull–Fréchet (EWFr) distribution is proposed. Its failure rate has a decreasing shape, an increasing shape, and an upside-down bathtub shape. Its density functio
Externí odkaz:
https://doaj.org/article/fd5a0431a2ee4e48a979f72a1e2e4964
Publikováno v:
Journal of Mathematics, Vol 2023 (2023)
One of the important features of generalized distribution is its ability and flexibility to model real-life data in several applied fields such as medicine, engineering, and survival analysis, among others. In this paper, a flexible four-parameter Lo
Externí odkaz:
https://doaj.org/article/3f8489c862a047019b4f2eaf00805dfa