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 Collection: UNT Theses and Dissertations
A Monte Carlo Study of the Robustness and Power Associated with Selected Tests of Variance Equality when Distributions are Non-Normal and Dissimilar in Form

A Monte Carlo Study of the Robustness and Power Associated with Selected Tests of Variance Equality when Distributions are Non-Normal and Dissimilar in Form

Date: August 1990
Creator: Hardy, James C. (James Clifford)
Description: When selecting a method for testing variance equality, a researcher should select a method which is robust to distribution non-normality and dissimilarity. The method should also possess sufficient power to ascertain departures from the equal variance hypothesis. This Monte Carlo study examined the robustness and power of five tests of variance equality under specific conditions. The tests examined included one procedure proposed by O'Brien (1978), two by O'Brien (1979), and two by Conover, Johnson, and Johnson (1981). Specific conditions included assorted combinations of the following factors: k=2 and k=3 groups, normal and non-normal distributional forms, similar and dissimilar distributional forms, and equal and unequal sample sizes. Under the k=2 group condition, a total of 180 combinations were examined. A total of 54 combinations were examined under the k=3 group condition. The Type I error rates and statistical power estimates were based upon 1000 replications in each combination examined. Results of this study suggest that when sample sizes are relatively large, all five procedures are robust to distribution non-normality and dissimilarity, as well as being sufficiently powerful.
Contributing Partner: UNT Libraries
An Exploratory Field Study of Adolescent Consumer Behavior: The Family Purchasing Agent

An Exploratory Field Study of Adolescent Consumer Behavior: The Family Purchasing Agent

Date: August 1989
Creator: Hardy, Jane P.
Description: An exploratory field study was conducted to examine internal and external factors that influence adolescents' consumer behavior when serving as the family purchasing agents. Demographic, lifestyle, and marketing activities were examined to determine the influences that affect whether the adolescent will purchase the preferred family brands or other brands. Participating adolescents were sent by their parents to the grocery store on two separate occasions to purchase four preselected grocery items. The brands purchased were recorded and compared to the preferred brand names provided by the parents. While no statistical significance was found, occasional trends were observed. The analysis indicated that adolescents who experience a pluralistic family communication style will purchase products other than the preferred household brands. Adolescents who are exposed to television and radio tend to deviate more from the preferred family brands more often than do adolescents with less media exposure. Adolescents who work are more likely to go to the grocery store more often for their families than do nonworking adolescents. Also, adolescents seem to possess a price sensitivity to both high and low-involvement grocery items.
Contributing Partner: UNT Libraries
Revealing What Urban Early Childhood Teachers Think About Mathematics and How They Teach It: Implications for Practice

Revealing What Urban Early Childhood Teachers Think About Mathematics and How They Teach It: Implications for Practice

Date: December 1999
Creator: Hare, Addie Y. V. McGriff
Description: Hersh (1986) states, "One's conception of what mathematics is affects one's conception of how it should be presented. One's manner of presenting it is an indication of what one believes to be most essential in it." In this research study, three hundred ninety-seven urban early childhood teachers were given a survey that examined their attitudes toward mathematics and mathematics teaching, their views of mathematics, views of teaching mathematics, and views of children learning mathematics. The purpose of this study was to identify the attitudes and beliefs of early childhood teachers in two urban school districts to determine if mathematics reform efforts made a difference in teachers' attitudes and beliefs about mathematics and its teaching. Questionnaires were mailed directly to teachers in one school district and principals distributed questionnaires in the other. Summary scores were calculated for parts of the instrument. The researcher performed descriptive statistics, comparative analysis, and conducted frequency distributions, t-tests, ANOVA, and Pearson Correlations. Findings revealed that teachers with 30 or more years of teaching experience had more positive attitudes toward mathematics than teachers with 1-3 years of experience. African American teachers had more positive attitudes toward mathematics and its teaching than other ethnic groups. Teachers who held ...
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Charles Ives and a Stylistic Analysis of his Three Piano Sonatas

Charles Ives and a Stylistic Analysis of his Three Piano Sonatas

Date: 1955
Creator: Harer, Carolyn Bertha
Description: This thesis has been written with several goals in mind. The first purpose has been to inform the reader about the life of Charles Ives and the influences he experienced that gave him the impetus to experiment and write music of a nature thirty years ahead of its time, while the rest of the world was basking in the waning light of Romanticism. The second purpose has been to describe in a short space general characteristics that may be found throughout the entire musical output of Ives. The third purpose has been to analyze in greater detail the major portion of his contributions to piano literature, the three piano sonatas, so that the student may better understand the complexities which will face him in performance of these compositions. Perhaps the strongest motivation for the present study has been the hope that it might induce more students to be explorers themselves and become familiar with this music of Ives.
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Physical and Functional Characterization of the xy1XYZ Region From TOL Plasmid pDK1 and its Associated Downstream Regulatory Elements

Physical and Functional Characterization of the xy1XYZ Region From TOL Plasmid pDK1 and its Associated Downstream Regulatory Elements

Date: August 1998
Creator: Hares, Douglas R. (Douglas Ryan)
Description: The nucleotide sequence for the pDKl TOL plasmid region encoding toluate-1,2-dioxygenase (Xy1XYZ, TO) was determined. TO is the first enzyme in the meta-cleavage operon, responsible for the conversion of toluates and benzoates to their carboxy-substituted diols. DNA sequence analysis revealed the presence of three open reading frames (ORF). The three ORFs correspond to xylX (1353 bp), xylY (486 bp) and xylZ (1008 bp), encoding predicted protein products of 51370 Da, 19368 Da and 36256 Da, respectively.
Contributing Partner: UNT Libraries
Social Support, Depression, and Cardiovascular Disease in Married, Middle-Aged/Older Adults

Social Support, Depression, and Cardiovascular Disease in Married, Middle-Aged/Older Adults

Date: August 2004
Creator: Hargett Thompson, Candace L.
Description: This study examined the relationship between physical health, social support, and depression in a married, middle-aged/older adult sample in which at least one partner has heart disease. The data was obtained from a national longitudinal study the Health and Retirement Survey (HRS) and is composed of selected respondents and their spouses. The HRS Wave 1 data that was used for these analyses was collected in 1992 and 1993. This study tested a stress buffer model predicting the relationship between physical health, social support, and depression. For study inclusion, participants must have been diagnosed with cardiovascular disease and received treatment in the last year. A heart disease construct was developed by calculating the level of disease by the number of conditions and medical treatments received within the last year. A second health category for other chronic health conditions included diabetes, arthritis, cancer, and chronic pain. These constructs were combined into a total disease construct, which provided a broad measure of health problems typical of an older adult population. Social support was determined by respondents' satisfaction with friends, neighbors, family, their marriage, and enjoyable time spent with their spouse. Social support was subdivided into two constructs separating spousal support from social support ...
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Dielectric Properties of Azotobacter vinelandii in a Microwave Field

Dielectric Properties of Azotobacter vinelandii in a Microwave Field

Date: December 1978
Creator: Hargett, John M.
Description: A resonant frequency cavity was used to determine the dielectric properties of various preparations of Azotobacter vinelandii ATTC 12837. It was found that the bacteria investigated did interact with microwave radiation in the absence of free water. The data presented here indicate that bacteria demonstrate frequency specific dielectric properties. The techniques employed in these experiments may also be used to determine microwave spectra of other species of bacteria in different physiological stages.
Contributing Partner: UNT Libraries
The Genio-Hyoid Vocal Interference

The Genio-Hyoid Vocal Interference

Date: June 1960
Creator: Hargrave, William Kossuth
Description: None
Contributing Partner: UNT Libraries
Children's Attitudes Toward Death

Children's Attitudes Toward Death

Date: May 1974
Creator: Hargrove, Eddie L.
Description: None
Contributing Partner: UNT Libraries
An Exploratory Study of Children's Ideas About Death, with a View Toward Developing an Explanatory Model

An Exploratory Study of Children's Ideas About Death, with a View Toward Developing an Explanatory Model

Date: May 1979
Creator: Hargrove, Eddie L.
Description: None
Contributing Partner: UNT Libraries