Scientific Publishing Center | Researches | A Simulation Study on Tests of Hypotheses for Fixed Effects in Mixed Models for One-Way ANOVA under the Violation of the Equal Variances Assumption of the Treatment Groups with and without Missing Data

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Document Details

Document Type	:	Article In Journal
Document Title	:	A Simulation Study on Tests of Hypotheses for Fixed Effects 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	:	Mathematics
Document Language	:	English
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	:	1429 AH 2008 AD
Number Of Pages	:	11
Article Type	:	Article
Added Date	:	Sunday, October 11, 2009

Researchers

Researcher Name (Arabic)	Researcher Name (English)	Researcher Type	Dr Grade	Email
علي حسين المرشدي	Ali Hussein Al-Marshadi	Researcher
عبدالله حمود الحربي	Abdullah H. Al-Harbey	Researcher

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