Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 5 of 5 for “"heterogeneity of variance"”.
-
Design and analysis for a two level factorial experiment in the presence of dispersion effects
… location models involve the assumption of homogeneous variance throughout the design region. However, with heterogeneity of variance these standard designs are not optimal. Using the D and Q-optimality criteria, this dissertation proposes a two-stage experimental design procedure that …
-
The development and validation of a user's model for interactive text editing
Interactive computer editors are an integral part of today's growing computer systems. In spite of this, their design is often determined by tradition or designer intuition, rather than empirical evidence. These studies explore a method of deriving naive and expert user models by use of a …
-
A Comparison Of Ordinary Least Squares, Weighted Least Squares, And Other Procedures When Testing For The Equality Of Regression
<p>When testing for the equality of regression slopes based on ordinary least squares (OLS) estimation, extant research has shown that the standard F performs poorly when the critical assumption of homoscedasticity is violated, resulting in increased Type I error rates and reduced statistical power …
-
Model-based Tests for Standards Evaluation and Biological Assessments
Implementation of the Clean Water Act requires agencies to monitor aquatic sites on a regular basis and evaluate the quality of these sites. Sites are evaluated individually even though there may be numerous sites within a watershed. In some cases, sampling frequency is inadequate and the …
-
An empirical study of advertised retail meat prices in a metropolitan area
The major portion of all food items is ultimately sold through retail outlets, most of which are large supermarkets. Since market conduct in food retailing notably affects social welfare, it warrants empirical examination. Retail food pricing and advertising behavior is of perennial interest to …