Document Details

Document Type : Article In Journal 
Document Title :
A Simulation Study On Tests Of Hypotheses For Fixed Effect In Mixed Models For One-Way Anova Under The Violation Of The Equal Variances Assumption Of The Treatment Groups With And Without Missing Data
دراسة بطريقة المحاكاة عن اختبارات الفروض لتأثيرات ثابتة باستخدام النموذج المخلوط لتحليل التباين ذي الاتجاه الواحد عندما يكون شرط تساوي التباين لمجموعات المعالجات غير متحقق في حالة وجود وعدم وجود مشاهدات مفقودة
 
Subject : Statistics 
Document Language : Arabic 
Abstract : This article considers the analysis of experiment of oneway completely randomized design (one-way ANOVA) that is frequently used in every discipline. We investigate a common problem that is data collected in practice usually violate parametric assumptions to some degree. We concentrated our attention on ANOVA when the equal variances assumption for the treatment groups is violated. We investigate the performance of a general linear fixed effects model approach (GLM procedure of the SAS System) in analyzing one-way ANOVA under the violation of only one assumption that is heterogeneous variances. Also, we investigate the performance of a general linear mixed effects model approach (MIXED procedure of the SAS System) in analyzing one-way ANOVA under the violation of only one assumption that is heterogeneous variances as alternative to GLM procedure of the SAS System. The main result of our article is that the general linear mixed effects model approach can be recommended to be used in case of the suspicion of the violation of the equal variances assumption specially in case of unbalanced data where the general linear fixed effects model approach showed serious departures upward from the nominal level. 
ISSN : 1012-1319 
Journal Name : Science Journal 
Volume : 20 
Issue Number : 1 
Publishing Year : 2008 AH
2008 AD 
Article Type : Article 
Added Date : Saturday, May 17, 2008 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
علي حسين المرشديAl-Marshad, Ali HusseinResearcherDoctorateAALMarshadi@kau.edu
عبدالله حمود الحربيAl-Harbey, Abdullah HResearcherDoctorateaharbey@yahoo.com

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