TESTING VARIANCE COMPONENTS USING THE GLM AND MIXED PROCEDURES OF SAS®
نویسندگان
چکیده
منابع مشابه
Comparing the SAS GLM and MIXED Procedures for Repeated Measures
Repeated measures analyses in the SAS GLM procedure involve the traditional univariate and multivariate approaches. The SAS MIXED procedure employs a more general covariance structure approach. This paper compares the two procedures and helps you understand their methodologies. A numerical example illustrates many of the key similarities and differences.
متن کاملEstimating and testing variance components in a multi-level GLM
Most analysis of multi-subject fMRI data is concerned with determining whether there exists a significant population-wide 'activation' in a comparison between two or more conditions. This is typically assessed by testing the average value of a contrast of parameter estimates (COPE) against zero in a general linear model (GLM) analysis. However, important information can also be obtained by test...
متن کاملVariance components testing in the longitudinal mixed effects model.
This article discusses the asymptotic behavior of likelihood ratio tests for nonzero variance components in the longitudinal mixed effects linear model described by Laird and Ware (1982, Biometrics 38, 963-974). Our discussion of the large-sample behavior of likelihood ratio tests for nonzero variance components is based on the results for nonstandard testing situations by Self and Liang (1987,...
متن کاملExact Testing Procedures in SAS
In categorical data analysis, the majority of methods are based on asymptotic approaches. As we all know, asymptotic approaches are very easy to calculate, however, they may have an unsatisfied type I error control. Actual type I error rates of testing procedures could be underestimated or over-estimated for the discrete data. In addition, when power of the study is overestimated, sample size i...
متن کاملhazard evaluation of gas condensate stabilization and dehydration unit of parsian gas refinery using hazop procedures
شناسایی مخاطرات در واحد 400 پالایشگاه گاز پارسیان. در این پروزه با بکارگیری از تکنیک hazop به شناسا یی مخاطرات ، انحرافات ممکن و در صورت لزوم ارایه راهکارهای مناسب جهت افزایش ایمنی فرا یند پرداخته میگردد. شرایط عملیاتی مخاطره آمیز نظیر فشار و دمای بالا و وجود ترکیبات مختلف سمی و قابل انفجار در واحدهای پالایش گاز، ضرورت توجه به موارد ایمنی در این چنین واحدهایی را مشخص می سازد. مطالعه hazop یک ر...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Conference on Applied Statistics in Agriculture
سال: 1997
ISSN: 2475-7772
DOI: 10.4148/2475-7772.1311