Thesis (Ph. D.)--Lehigh University, 2000. / Includes vita. Includes bibliographical references (leaves 107-117).

One hundred twenty-two undergraduate students at the University of North Texas were administered several different optimism scales and also measures of similar constructs such as hope. Results indicated that most measures of optimism show only low to moderate intercorrelations with other measures of the same construct. Additionally, factor analysis confirmed that the measures of optimism actually appear to be assessing multiple factors and not necessarily optimism alone. Implications of the present study include the necessity of individual researchers to be familiar with the specific measure of optimism used in a given study as scores on differing measures of optimism may actually be providing very different information.

This study explores the use of two tests of optimism: the Youth Life Orientation Test (YLOT) and the Children’s Attributional Style Questionnaire (CASQ) in six English primary schools with children aged between 9 years and 12 years. The study grew out of some problems I was confronted with as part of my professional practice regarding the outcomes for children in a school that was failing to meet Government Targets in attainment. In the study I worked with the staff and 9 – 11 year old children in six primary schools in rural, town, suburban and inner-city contexts. The total number of children was 305. The children were tested using the CASQ and YLOT and a range of other measures. Cronbach alpha internal consistency coefficients (coefficient alpha) and test-retest coefficients for the subscales and overall scale of the CASQ and YLOT were calculated. The validity of each measure was explored using evidence from: test content; internal structure; relations to other variables; and from the consequences of testing. Lastly the use of the YLOT as a proxy and nature of any associations between the measures used was explored looking at individual; school and community level data. The study found that the YLOT has good psychometric properties and could be used as a basis for further work both professionally and for research. The Cronbach alpha reliability coefficient for the whole scale was 0.81. The psychometric properties of the CASQ were poor in that the subscales had very low reliability coefficients and the aggregated total scale reliability coefficient was still too low at 0.53 to be able to recommend the use of the CASQ. Before the CASQ could be used there would need to be extensive work to increase its reliability and validity through lengthening the test or changing the format of the questions to reduce their specificity. The use of the YLOT as a proxy indicator of mental health and associations with school and community level data were discussed. The YLOT could provide an indication of well being particularly in relation to childhood depression. The community level data were not sensitive enough to discern hypothesised associations between communities and the children attending the schools sited in the communities.

Thesis (Ph. D.)--Johns Hopkins University.

Thesis (Ph. D.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 132-142). Also available on the World Wide Web.

Thesis (Ph.D.)--Kent State University, 2007. / Title from PDF t.p. (viewed Mar. 19, 2009). Advisor: Ran Barniv. Keywords: recommendation optimism, research analyst rules, residual income valuation, stock returns. Includes bibliographical references (p. 145-156).

Thesis (Ph. D.)--Duke University, 2008.

Thesis (M.A.)--York University, 2007. Graduate Programme in Psychology. / Typescript. Includes bibliographical references (leaves 74-80). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR29305

Thesis (Ph. D.)--University of Oregon, 2002. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 186-188). Also available for download via the World Wide Web; free to University of Oregon users.

I present seven empirical studies that investigate two main themes regarding two main approaches of optimism: explanatory style and dispositional optimism. The first theme incorporates measurement issues and conceptual ideas of optimism and the second involves optimism interventions on depressive symptoms. In Study 1 I explored the potential psychometric structure of causal attributions and dispositional optimism. Attributions may be best viewed as reflecting large differences in cognitive style, and smaller independent positive- and negative-event biases. For dispositional optimism, a two-factor model was supported. Study 2 examined correlations between optimism and the Five-Factor Model of personality. Dispositional optimism and explanatory style had similar association patterns with personality, although there were some differences. Study 3 tested and supported a model in which dispositional optimism mediates the link between explanatory style and psychological well-being. Study 4 compared the levels of optimism expression in two ethnic groups, finding that Mainland Chinese participants were more optimistic and less pessimistic than White British. Study 5 examined attributional biases and found that individuals show more optimistic biased style for themselves than for other people. Studies 6 and 7 tested effectiveness of optimism interventions on depressive symptoms. It demonstrated that self-monitored optimism interventions on a daily basis could effectively reduce depressive symptoms and increase optimistic explanatory style. Taken together, the studies replicated some previous investigations regarding measurement issues and conceptual ideas of optimism, and explored novel approaches to examining the essence of attributional bias and effectiveness of optimism interventions in depression treatment. My investigation of attributional bias is the first to test this idea using new and comparable measures of attributions. Practicing self-administered optimism interventions is, to my knowledge, also the first time these interventions have been applied in a sample with mild-to-moderate depressive symptoms. This may provide an easily monitored and low-cost alternative to traditional treatments of depression.