Title of Document: A COMPARISON OF METHODS FOR TESTING FOR INTERACTION EFFECTS IN STRUCTURAL EQUATION MODELING Brandi A. Weiss, Doctor of Philosophy, 2010 Directed By: Chair, Dr. Gregory R. Hancock, Department of Measurement, Statistics and Evaluation Chair, Dr. Jeffrey R. Harring, Department of Measurement, Statistics and Evaluation The current study aimed to determine the best method for esti...

Rigorous principles ' shall govern the approaches to analyzing data in the Systolic Hypertension in the Elderly Program (SHEP). In particular, analyses shall adhere to the "intention-to-treat rule," that is, randomized patients shall remain in their assigned treatment group regardless of the treatment actually received. The primary end point in SHEP is the occurrence of fatal or nonfatal stroke...

Side impact crash is a leading cause of fatalities on the roadways of the industrialized world. In the mid 1990's NHTSA implemented a new car assessment program testing the lateral crashworthiness of vehicles entering the market with a moving deformable barrier. Previous work has been done in an attempt to distill these tests into finite element simulations using specific vehicle test results; ...

PURPOSE This pilot study examines the effects of walking a labyrinth. METHOD A convenience sample of 25 community members participated in a four-group, repeated measures study to gather information about vital signs and affect before and after labyrinth walks. Because of the small sample size, results were inspected for effect size (ES) differences in pre-to postcomparisons. Mean postwalk sco...

In the present article, we investigate predictors of how often a scientific article is cited. Specifically, we focus on the influence of two often neglected predictors of citation rate: effect size and sample size, using samples from two psychological topical areas. Both can be considered as indicators of the importance of an article and post hoc (or observed) statistical power, and should, esp...

Generally, the traditional Shewhart p chart has been developed by for charting the binomial data. This chart has been developed using the normal approximation with condition as low defect level and the small to moderate sample size. In real applications, however, are away from these assumptions due to skewness in the exact distribution. In this paper, a modified Exponentially Weighted Moving Av...

‎ In many experiments, such as biology and quality control problems, sample size cannot always be considered as a constant value. Therefore, the problem of predicting future data when the sample size is an integer-valued random variable can be an important issue. This paper describes the prediction problem of future order statistics based on upper and lower records. Two different cases for the ...

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...