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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
441

Preservice teacher preparation for managing problem behaviors : an interpretive qualitative analysis of the classroom management course

Dunn, Sandra Hall 09 August 2012 (has links)
This dissertation examines the content of a required classroom management course to determine how preservice teachers are prepared for managing problem behaviors. Qualitative content analysis of interviews with four adjunct classroom management course instructors, their course syllabi, textbooks, assignments and projects, ancillary course materials, fieldwork, and formative assessment revealed how the topic of problem behaviors is incorporated and implemented in the design of the course and how the topic is addressed in the textbooks and other course materials selected for the course. The complexities of scholarly research, individual course instructors’ personal beliefs about classroom and behavior management and problem behaviors, and the implications of those personal beliefs upon text selection and course content that guide the preservice teacher’s developing philosophies to meet the challenges of today’s diverse educational settings provide the foundation for this interpretive analysis. Findings suggest that, regardless of the documented need for additional preservice teacher preparation in managing student behavior in general and problem behavior specifically, course content on problem behaviors in the classroom management course depends upon the course instructors’ personal beliefs about classroom and behavior management that developed through their personal knowledge, experience, and preferences. Academic freedom serves as a centerpiece of university professor and student rights. Academic freedom must support academic responsibility in the design, implementation, and evaluation of curriculum, preparation of course materials, complementary course offerings, and a competent and judicious treatment of the subject. Findings of this study reveal that the university’s academic responsibility for providing a “competent and judicious treatment of the subject” relies upon the personal beliefs of the individual course instructor. / text
442

Estimating population histories using single-nucleotide polymorphisms sampled throughout genomes

McTavish, Emily Jane Bell 05 November 2013 (has links)
Genomic data facilitate opportunities to track complex population histories of divergence and gene flow. We used 47,506 single-nucleotide polymorphisms (SNPs) to investigate cattle population history. Cattle are descendants of two independently domesticated lineages, taurine and indicine, that diverged 200,000 or more years ago. We found that New World cattle breeds, as well as many related breeds of cattle in southern Europe, exhibit ancestry from both the taurine and indicine lineages. Although European cattle are largely descended from the taurine lineage, gene flow from African cattle (partially of indicine origin) contributed substantial genomic components to both southern European cattle breeds and their New World descendants. We extended these analyses to compare timing of admixture in several breeds of taurine-indicine hybrid origin. We developed a metric, scaled block size (SBS), that uses the unrecombined block size of introgressed regions of chromosomes to differentiate between recent and ancient admixture. By comparing test individuals to standards with known recent hybrid ancestry, we were able to differentiate individuals of recent hybrid origin from other admixed individuals using the SBS metric. We genotyped SNP loci using the bovine 50K SNP panel. The selection of sites to include in SNP analyses can influence inferences from the data, especially when particular populations are used to select the array of polymorphic sites. To test the impact of this bias on the inference of population genetic parameters, we used empirical and simulated data representing the three major continental groups of cattle: European, African, and Indian. We compared the inference of population histories for simulated data sets across different ascertainment conditions using F[subscript ST] and principal components analysis (PCA). Ascertainment bias that results in an over-representation of within-group polymorphism decreases estimates of F[subscript ST] between groups. Geographically biased selection of polymorphic SNPs changes the weighting of principal component axes and can bias inferences about proportions of admixture and population histories using PCA. By combining empirical and simulated data, we were able to both test methods for inferring population histories from genomic SNP data and apply these methods to practical problems. / text
443

The effects of homophobia, legislation, and local policies on heterosexual pupil services professionals' likelihood of incorporating gay affirming behaviors in their professional work with sexual minority youths in public schools

Smith, Lance Santoro 01 June 2007 (has links)
Research suggests that non-judgmental, unbiased counseling (that includes an advocacy component) is effective in addressing the psycho-social needs of sexual minority youths--a population of students considered at-risk (Reynolds & Koski, 1994; Savin-Williams, 1994). The ability to provide such services is impeded if the clinician has not first come to terms with his or her own feelings and attitudes about homosexuality (Pederson, 1988). This study examined the attitudes and anticipated professional behaviors relevant to sexual minority youths of 309 pupil services professionals in the fields of school psychology, school social work, school nursing, and school counseling. Participants from two regions of the US (Florida and New Jersey) responded to a survey comprising a homophobia measure and a measure of anticipated professional behavior toward sexual minority youths, and questionnaires collecting demographic information. Results of multiple regression analysis, with the significance level set at .05, indicated that levels of homophobic bias were positively correlated with political conservatism (r = .52), high religiosity (r = .51), and lower education levels (r = .30) among the participants. Furthermore, a backward elimination model predicting biased professional behaviors toward sexual minority youths was significant (p = .001). Results indicated that those less likely to employ gay affirming professional behaviors were more politically conservative (p = .001) than those more likely to do so. Implications of this study suggest that even among these counseling professionals, personal ideologies and dogmatic belief systems could potentially impede many of their ability or willingness to advocate in behalf of sexual minority students. Training efforts, therefore, should assist these professionals in distinguishing between their personal ideologies with regard to sexual orientation diversity and their professional responsibility to serve the needs of all students.
444

CULTURAL BIAS IN THE CALIFORNIA ACHIEVEMENT TESTS: A FOCUS ON INTERNAL INDICES.

COOK, PAUL CHRISTOPHER. January 1987 (has links)
This research focused on the cultural bias in the items the California Achievement Tests (CAT). Performance variability was examined across all individual items of the CAT for the third graders from four ethnic groups. A sample of 1600 third grade children was randomly selected from population of children attending various elementary schools in the state of Arizona. Four hundred subjects within each ethnic group were matched for sex, ethnicity, and grade level. A two-factor (items scores and ethnicity) ANOVA procedure was used to examine the interaction between the item performances and ethnicity for groups of Anglo and Black, Hispanic, and American Indian on all individual test items of the eight subtest of the CAT. An examination of obtained findings revealed that a total of 31 items were found to be as culturally biased against Hispanic, Blacks, and Native-American children. Of these items, thirty were biased toward American Indians, six items were biased toward Hispanics, and four items were biased toward Blacks. Some items were biased toward more than one ethnic group. Twenty-eight items identified as biased belonged to five of the six language subtests and three items are part of one of the two mathematics subtests. It should be noted that even though most of the items (98%) did not reveal any statistical evidence of bias, there were only four items (1.9%) on which minority group children performed higher than did the Anglo children. The overall direction of the findings would seem to suggest that most of the content of the CAT is free from cultural bias.
445

Evaluation of the Performance of Satellite Precipitation Products over Africa

Merino, Manuel January 2013 (has links)
In the context of the SERVIR-Africa project, the SERVIR Arizona Team is developing streamflow forecast systems on African basins using Satellite Precipitation Products (SPP) to drive the models. These products have errors that need to be addressed before using them to drive hydrologic models. An analysis of the errors of the Satellite Precipitation Products TMPA-3B42RT, CMORPH, and PERSIANN over Africa is presented, followed by bias correction and error reduction methods to improve the remote sensed estimates. The GPCP 1-degree-day reanalysis product was used as the rainfall truth dataset. The Bias Correction Spatial Downscaling (BCSD) method developed by Wood et al., was used successfully to reduce the errors of SPP. The original and bias corrected estimates from the three SPP are used to calibrate and simulate three catchments of the Senegal River basin using HYMOD, finding that the use of bias corrected estimates produces a significant improvement in streamflow simulation.
446

The cointegrating relationship in Asian markets with applications to stock prices, exchange rates and interest rates

Tanonklin, Tippawan January 2013 (has links)
The aim of this research is to investigate the long-run co-integrating relationships in the Asian markets. Our research focuses on 4 areas; pair trading, out-of-sample forecasting, testing the unbiased forward exchange rate hypothesis and testing the expectation hypothesis of the term structure of interest rates. The introduction is provided in chapter one. In chapter two, we develop a pairs trading strategy using individual stocks listed in the Stock Exchange of Thailand. Engle and Granger approach is used to identify the potential pairs that are cointegrated. The results show that pairs trading strategy is profitable in this market. Chapter three examines the forecasting performance of the error correction model on daily share price series from the Stock Exchange of Thailand. The disequilibrium term is classified into “correct” and “mix” sign based on Alexander (2008)’s criterion; the results indicate that the error correction component can help to improve the predictability in the long run. Chapter four tests the unbiased forward rate hypothesis of 11 Asian exchange rates using linear conventional regression, ECM and logistic smooth transition regression with the forward premium as the transition variable. Out-of-sample forecasting results also suggest that inferior forecasting performance could be obtained as a result of using linear models. In chapter five, we investigate the expectation hypothesis of the term structure of interest rate for four Asian countries. We employ linear models and nonlinear approaches that allow to capture asymmetric and symmetric adjustments. The result also indicates that the term structure can be better modeled by means of LSTR models. The forecasting exercise also confirms these findings.
447

The Efficiency of K-12 Public Education Production, Gender Inequalities in College Advising, and Labor Market Implications

Thompson, Shane January 2013 (has links)
My dissertation consists of three chapters that focus on the economics of education. In particular I look at public school financing, gender discrimination in advising, and the effectiveness of out-of-school-time programs for disadvantaged schools. The first chapter analyzes the effect of an extremely large funding shock on Wyoming public schools in the 2006-07 school year. The effect of the shock is estimated on high school graduation rates and NAEP math and reading scores via synthetic control methods. The funding shock in Wyoming, which was the largest increase in education expenditure for any state in the nation from 1998-2008, is shown to have been largely unsuccessful in raising graduation rates and test scores. The second chapter uses a field experiment to analyze college advising differentials by student and advisor gender. Advisors assess the expected performance of students in both mathematics and English and recommend one of the two subjects to the student. Surveys are randomly assigned, and the experiment is designed such that student gender is the treatment. Advisors are found to discount the ability of female students relative to males in both mathematics and English. Additionally, male advisors recommend mathematics with much greater likelihood than do female advisors. The final chapter analyzes the effect of the 21st Century Community Learning Centers program on disadvantaged schools. Using a regression discontinuity design, it is found that 21CCLC has a more positive effect on middle schoolers than on elementary school students, but that results vary widely depending on the cohort and grade level. The program seems to have potential for significant improvement in school outcomes, but also has potential to have negative effects. There is some evidence from 2007-2011 that the program is improving over time.
448

An Apportionment of African Genetic Diversity Based on Mitochondrial, Y Chromosomal, and X Chromosomal Data

Pilkington, Maya Christine Metni January 2008 (has links)
In an effort to better understand patterns of genetic variation in modern African populations, I surveyed nucleotide variability at four loci in five diverse sub-Saharan African populations. First, I analyzed the mitochondrial DNA (mtDNA) and the non-recombining portion of the Y chromosome (NRY), asking specifically if similar models of population size change could be fit to re-sequencing data from these two loci when examined in the same populations. Four tests of population growth were employed and results indicated that food-producing populations best fit a model of exponential growth for the mtDNA but not the NRY, and hunter-gathering populations best fit a model of constant population size for both mtDNA and the NRY. These results are likely due to sex-specific migration or differences in the effective population sizes of males and females.Next, I examined mtDNA and NRY population structure in these same populations, to assess the relative effects of migration and effective population size on patterns of mtDNA and NRY nucleotide variability. I used an Isolation with Migration (IM) model to disentangle estimates of effective population size and migration. Results indicated that levels of mtDNA population structure are higher than those of the NRY, and female migration tends to be unidirectional while that of males is largely bidirectional. I found that in food-producing populations, male migration rate estimates are in fact higher, not lower, than those of females, while estimates of male effective population size are strikingly small. I infered that males have experienced a period of population size reduction due to replacement, and that this most likely occurred during the Bantu expansions, approximately 5,000 years ago.Finally, I assessed population structure in these populations using a multilocus approach which estimated current and ancestral effective population sizes, migration rates, split times and fraction of the ancestral population that contributed to current populations. Current and ancestral effective population sizes ranged from ~5,000-8,000 individuals. Most populations showed an increase in size relative to the ancestral population. Population split times ranged from 17-142 thousand years (KYR); the Khoisan split times were the oldest and the Niger-Congo speaking populations' split times the most recent. Since the oldest population split times precede the dates for the earliest modern humans outside of Africa, I posited that modern humans likely evolved at a time when structured populations already existed in Africa.
449

Self-Perceptions of Adolescents with ADHD for their Problem Behaviors

Varma, Angela 14 January 2014 (has links)
The overarching goal of this dissertation was to examine the self-perceptions of adolescents with ADHD with regard to their core ADHD symptoms and associated problem behaviors. Self-perceptions were examined in relation to awareness of problem behaviors (i.e., presence of a “positive illusory bias” or PIB), attributions, and stigma. Study 1 examined the PIB in relation to the ignorance of incompetence hypothesis in 74 13-to-18 year old adolescents [40 ADHD; 34 Typically-Developing Comparison (TD)]. Compared to TD adolescents, adolescents with ADHD underestimated their ADHD symptoms and associated oppositional, academic, and social problems relative to parent raters, indicating that they have a PIB. Nevertheless, they were cognizant of their patterns of academic achievement and social problems. The only area in which adolescents with ADHD demonstrated limited awareness of their difficulties was for oppositional behaviors. Within the ADHD sample, adolescents with external locus of causality attributions had a higher PIB for oppositional behaviors than adolescents with ADHD with internal locus of causality attributions. Using a cross-sectional design, Study 2 examined the PIB, attributions, and stigma perceptions in 66 14-to-18 year old adolescents (31 ADHD, 35 TD) and 107 9-to-12 year old children (65 ADHD, 42 TD); cognitive immaturity as a mechanism for the PIB and developmental differences in attribution patterns and stigmatization were the focus. Although both children and adolescents with ADHD demonstrated a PIB for their ADHD symptoms, the magnitude of the PIB was reduced in adolescence (particularly for hyperactivity-impulsivity). Both adolescents with and without ADHD showed a reduction in the PIB for inattentive symptoms relative to children. Participants with ADHD viewed their problem behaviors as more pervasive, uncontrollable, and stigmatizing than participants without ADHD, and adolescents viewed their behaviors as more pervasive, uncontrollable, and stigmatizing than children. The findings offered theoretical support to the cognitive immaturity mechanism for the PIB and to Harters(2012) model of normative development of self-representations. Associations were found between the PIB and attributions. Minimal support was obtained for the ignorance of incompetence hypothesis in most domains. Future research directions and clinical implications are discussed.
450

Subtle Bias in Legal Decision Making: How Attitudes and Social Norms Affect Primary and Peripheral Targets

Huggon, William Gordon 20 March 2014 (has links)
Before the 1990s controlled research using mock jurors consistently found black defendants guilty more often than white. However, more recently, research has generally failed to find this effect. One explanation is that prejudice has been reduced so much that there is no longer an effect. While there does seem to have been a reduction in overt prejudice, it is unlikely that it has decreased to the point that it does not affect verdicts. A more likely explanation is that strong social norms exist concerning prejudice which result in efforts to avoid being (or appearing) biased. Thus, when motivation to reduce prejudice is salient, mock jurors and perhaps real jurors will display little or no prejudice; but when motivation to reduce prejudice is not salient, decision-making becomes spontaneous and whatever prejudice does exist will affect decisions. In a series of 6 studies, race of defendant, race of witness, and the salience of the importance of being unbiased were varied. Results revealed a complex situation with many factors playing a part. Race of key alibi witness played a key role, with the white witness favoured, and the black witness mistrusted. Outcomes may be partially predicted based on Social Dominance Orientation (SDO). Those high in SDO treat incongruent defendant/witness race pairs more harshly than congruent race pairs. Modern apparently egalitarian outcomes are perhaps due to low prejudice participants’ bias in favour of black defendants while high prejudice participants were biased against black defendants – effectively cancelling out each others’ verdicts. Those low in SDO treat incongruent defendant/witness race pair too leniently as compared to congruent race pairs. When race is made salient, bias is reduced, and though the average results are still essentially egalitarian, these verdicts are more truly egalitarian – much fairer and less biased when considered at an individual level. These results also reinforce theories of dual process models of attitudes. Individuals may have common stereotype knowledge, but separate activation based on prejudice levels. Both high and low prejudiced individuals can control bias with the proper motivation.

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