Efficient crossover designs for comparing t test treatments to one control treatment with three periods is considered. Through this investigation and the characterization obtained for the A-optimal/efficient designs in the nearly entire class, the efficiency of a given design is evaluated and guidance for constructing highly efficient designs is provided.

This investigation compared the priority given to 14 sport-related values by 11 wrestlers with normal sight and 11 with visual impairments. The Survey of Values in Sport was given to 22 high school wrestlers during the competitive season. Independent t tests were used to evaluate differences in priority of values between the two groups. Significant differences were found on cooperation, group c...

The goal of this study was to examine the relationship between kinematics, motor abilities, anthropometric characteristics, and the initial (10 m) and secondary (30 m) acceleration phases of the 100 m sprint among athletes of different sprinting performances. Eleven competitive male sprinters (10.96 s ± 0.36 for 100 with 10.50 s fastest time) and 11 active students (12.20 s ± 0.39 for 100 m wit...

Various statistical methods, developed after 1970, offer the opportunity to substantially improve upon the power and accuracy of the conventional t test and analysis of variance methods for a wide range of commonly occurring situations. The authors briefly review some of the more fundamental problems with conventional methods based on means; provide some indication of why recent advances, based...

INTRODUCTION The present study aimed to compare self-assessment forms of coursework taught in the school of public health at undergraduate, graduate, and postgraduate levels and students' evaluation of the performance of the faculty members at these levels. METHODS The subjects in this cross-sectional study were the faculty members and students of the School of Public Health and Nutrition, Sh...

We consider the situation in two sample testing when one variance is assumed to be known while the other variance is considered unknown. This situation arises, for example, when one is interested in comparing a standard treatment with a new treatment. Although this situation occurs relatively infrequently, our example discusses the important tool of moment matching and makes the classic two sam...

BACKGROUND Millions of workers are the victims of different kinds of accidents every year throughout the world. The purpose of this study was to investigate the relationships between safety attitude and occurrence of the occupational accidents. METHODS This investigation was a cross-sectional study performed in a gas refinery in south of Iran in 2008. Sample size of this study was 176 people....

This study aimed to determine whether a difference in productivity exists between clinicians supervising and not supervising a Level II occupational therapy student and whether factors including clinician years of experience, practice setting, and clinician productivity without a student could predict clinician productivity while supervising a student. We used paired-sample t tests to examine c...