Objective. This thesis examines the extent to which an intelligence test, the Reynolds Intellectual Assessment Scales (RIAS), aligned with the Carroll-Horn-Cattell theory of intelligence in children ages 4-18 who are either typically-developing or who have a variety of clinical impairments. Other aspects of the RIAS’s construct validity were also evaluated, including its relationship with the Wechsler Intelligence Scales for Children – Fourth Edition (WISC-IV) and whether the RIAS measures intelligence in the same way in typically-developing children as in children with traumatic brain injury (TBI). Methods. Confirmatory factor analysis was used to evaluate the fit of one-factor (g) and two-factor (Verbal Ability and Non-Verbal ability) models in each sample. Configural and measurement invariance of each model were evaluated across the typically-developing group and a group of children with TBI. Correlations between scores on the RIAS and WISC-IV were examined in a group of children with clinical disorders. Results. The two-factor model fit the data of both groups while the one-factor model provided good fit to only the typically-developing group`s data. Both models showed configural invariance across groups, measurement invariance of the two-factor model, and partial measurement invariance of the one-factor model (What`s Missing subtest unconstrained), but scalar invariance was not established for either model. RIAS’s verbal subtests and indexes correlated with theoretically consistent WISC-IV indexes but the RIAS’s nonverbal subtests and indexes did not correlate highly with WISC-IV performance subtests. All RIAS index scores were higher than WISC-IV index scores. Conclusions. Evidence for the interpretability of the NIX and VIX as separate indexes was not found. The VIX is a valid index of crystallized abilities but the NIX does not adequately measure fluid intelligence. The CIX appears to provide a valid measure of g, but may be overly reliant on verbal abilities. The RIAS has significant validity issues that should limit its use in making important decisions. / Graduate

Anxiety sensitivity is a multifaceted cognitive risk factor currently being examined in relation to anxiety and depression. The paucity of research on the relative contribution of the facets of anxiety sensitivity to anxiety and depression, coupled with variations in existing findings, indicate that the relations remain inadequately understood. In the present study, the relations between the facets of anxiety sensitivity, anxiety, and depression were examined in 730 Hispanic-Latino and European-American youth referred to an anxiety specialty clinic. Youth completed the Childhood Anxiety Sensitivity Index, the Revised Children’s Manifest Anxiety Scale, and the Children’s Depression Inventory. The factor structure of the Childhood Anxiety Sensitivity Index was examined using ordered-categorical confirmatory factor analytic techniques. Goodness-of-fit criteria indicated that a two-factor model fit the data best. The identified facets of anxiety sensitivity included Physical/Mental Concerns and Social Concerns. Support was also found for cross-ethnic equivalence of the two-factor model across Hispanic-Latino and European-American youth. Structural equation modeling was used to examine models involving anxiety sensitivity, anxiety, and depression. Results indicated that an overall measure of anxiety sensitivity was positively associated with both anxiety and depression, while the facets of anxiety sensitivity showed differential relations to anxiety and depression symptoms. Both facets of anxiety sensitivity were related to overall anxiety and its symptom dimensions, with the exception being that Social Concerns was not related to physiological anxiety symptoms. Physical/Mental Concerns were strongly associated with overall depression and with all depression symptom dimensions. Social Concerns was not significantly associated with depression or its symptom dimensions. These findings highlight that anxiety sensitivity’s relations to youth psychiatric symptoms are complex. Results suggest that focusing on anxiety sensitivity’s facets is important to fully understand its role in psychopathology. Clinicians may want to target all facets of anxiety sensitivity when treating anxious youth. However, in the context of depression, it might be sufficient for clinicians to target Physical/Mental Incapacitation Concerns.

The Yale-Brown Obsessive-Compulsive Scale (Y-BOCS) is considered the “gold standard” for measuring symptoms for Obsessive-Compulsive Disorder (OCD) due to the high reliability and validity of the measure. Originally, the Y-BOCS was divided into Obsessive and Compulsive factors; however, literature on the factor structure of the Y-BOCS is inconsistent. Models range from one global factor to different interpretations of bi-factor models to three-factor models. Inconsistencies between models may be attributed to sampling error, including participants with subclinical OCD in some samples, and measurement error. In addition, many researchers treat the Y-BOCS measurement as an interval or ratio scale when it likely reflects ordinal measurement. Our paper has two primary aims. First, we compare the fit of the models proposed in the literature using a large sample from multiple sites of patients diagnosed with OCD. We also evaluate how the models can be improved and whether those improvements show evidence for convergent validity. We treat the Y-BOCS observations as ordinal data. Second, we evaluate measurement and structural invariance between genders. Additionally, we examine convergent validity of the factor structure of the best fitting model with subscales of the OCI-R. Data from five separate samples were combined into one dataset with 288 total participants all formally diagnosed with OCD. We selected several Y-BOCS factor models from the literature and used confirmatory factor analysis to evaluate goodness of fit indices on our pooled sample. Only one model approached acceptable goodness of fit indices. We considered the factors in this model and proposed a new factor model with a global factor (OCD) and two sub-factors (Obsessions and Resistance to Symptoms). Our model exhibited the highest goodness of fit indices which we further improved with modifications to our factor model. On invariance analyses, our model exhibited measurement invariance between genders and partial structural invariance. Additionally, the latent factors of our model exhibited convergent validity with all of the OCI-R subscales (except Ordering). Our model exhibited stronger goodness of fit indices with our data than existing models in the Y-BOCS literature and measurement invariance and partial structural invariance between genders. We recommend that future studies replicate the efficacy of our factor model using the Y-BOCS as an ordinal measurement.

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Made available in DSpace on 2016-03-22T17:26:59Z (GMT). No. of bitstreams: 1 jaciana.pdf: 667514 bytes, checksum: 543d150a01c06b10933602382c393667 (MD5) Previous issue date: 2012-01-12 / The Big Five theory has been the basis for much of the personality assessment work conducted recently. Currently this is the theory that provides a better understanding of personality. The Big Five inventory- 10 (BFI-10) is a scale composed of 10 items that assesses five dimensions of personality, with two items for each factor: Extroversion, Agreeableness, Conscientiousness, Neuroticism and Openness. The purpose of this study due to the need for a brief instrument based on Big Five Theory for use in research in Brazil. Were interviewed 1158 people, being the majority female (58%) aged between 14 and 35 years. In the original form of the instrument was added one item in each factor to select later the 10 items with better psychometric qualities. There was evidence of construct validity and the rates of internal consistence were acceptable. At the end of the analysis it was identified that Neuroticism was the factor that demonstrated greater legitimacy, whereas Agreeableness was the less representative. Associations were observed among factors and the sociodemographic variables: gender, age and scholarity. It has been concluded that the adapted BFI-10 can be used when the time available is very limited. Considering the limitations of a so brief scale, the results should be interpreted cautiously. Further studies should be made to complement the psychometric characteristics of the scale / Recentemente a teoria Big Five tem servido de base para grande parte do trabalho de avaliação da personalidade. O Big Five Inventory 10 (BFI-10) é uma escala de 10 itens (dois a cada fator), que avalia cinco dimensões da personalidade: Extroversão; Amabilidade; Conscienciosidade; Neuroticismo e Abertura a experiências. A adaptação de um instrumento baseado no BFI-10 foi o propósito do presente estudo, em função da necessidade de um instrumento breve baseado na teoria Big Five para uso em pesquisas no Brasil. Foram entrevistadas 1158 pessoas, 58% do sexo feminino, com idades entre 14 e 35 anos. À forma original do instrumento foi acrescentado um item em cada fator para selecionar posteriormente os 10 com melhores resultados. As evidências de validade de construto e os índices de fidedignidade foram aceitáveis. O fator Neuroticismo teve os melhores resultados, enquanto Amabilidade foi o menos representativo. Foram observadas associações entre os fatores e as variáveis sóciodemográficas: gênero, idade e escolaridade. Concluiu-se que a escala baseada no BFI-10 poderá ser utilizada quando o tempo disponível for muito limitado. Considerando as limitações de uma escala breve, os resultados devem ser interpretados com precaução. Novos estudos devem ser feitos para complementar as características psicométricas da escala

This thesis presents an empirical investigation into the Arbitrage Pricing Theory (APT). At the onset of the thesis it is recognised that tests of the APT are conditional on a number of preconditions and assumptions. The first line of investigation examines the effect of the assumed nature of the form of the return generating process of stocks. It is found that stocks follow an approximate factor structure and tests of the APT are sensitive to the specified form of the return generating process. We provide an efficient estimation methodology for the case when stocks follow an approximate factor structure. The second issue we raise is that of the appropriate factors, the role of the market portfolio and the performance of the APT against the Capital Asset Pricing Model (CAPM). The conclusions that we draw are that the APT is robust to a number of specified alternatives and furthermore, the APT outperforms the CAPM in comparative tests. In addition, within the APT specification there is a role for the market portfolio. Through a comparison of the results in chapters 2 and 3 it is evident that the APT is not robust to the specification of unexpected components. We evaluate the validity of extant techniques in this respect and find that they are unlikely to be representative of agents actual unexpected components. Consequently we put forth an alternative methodology based upon estimating expectations from a learning scheme. This technique is valid in respect to our prior assumptions. Having addressed these preconditions and assumptions that arise in tests of the APT a thorough investigation into the empirical content of the APT is then undertaken. Concentrating on the issues that the return generating process must be unique and that the estimated risk premia should be stable overtime the results indicate that the APT does have empirical content. Finally, armed with the empirically valid APT we proceed to analyse the issue of seasonalities in stock returns. The results confirm previous findings that there are seasonal patterns in the UK stock market, however, unlike previous findings we show that these seasonal patterns are part of the risk return structure and can be explained by the yearly business cycle. Furthermore, the APT retains empirical content when these seasonal patterns are removed from the data. The overall finding of this thesis is that the APT does have empirical content and provides a good description of the return generating process of UK stocks.

abstract: This study investigated the internal factor structure of the English language development Assessment (ELDA) using confirmatory factor analysis. ELDA is an English language proficiency test developed by a consortium of multiple states and is used to identify and reclassify English language learners in kindergarten to grade 12. Scores on item parcels based on the standards tested from the four domains of reading, writing, listening, and speaking were used for the analyses. Five different factor models were tested: a single factor model, a correlated two-factor model, a correlated four-factor model, a second-order factor model and a bifactor model. The results indicate that the four-factor model, second-order model, and bifactor model fit the data well. The four-factor model hypothesized constructs for reading, writing, listening and speaking. The second-order model hypothesized a second-order English language proficiency factor as well as the four lower-order factors of reading, writing, listening and speaking. The bifactor model hypothesized a general English language proficiency factor as well as the four domain specific factors of reading, writing, listening, and speaking. The Chi-square difference tests indicated that the bifactor model best explains the factor structure of the ELDA. The results from this study are consistent with the findings in the literature about the multifactorial nature of language but differ from the conclusion about the factor structures reported in previous studies. The overall proficiency levels on the ELDA gives more weight to the reading and writing sections of the test than the speaking and listening sections. This study has implications on the rules used for determining proficiency levels and recommends the use of conjunctive scoring where all constructs are weighted equally contrary to current practice. / Dissertation/Thesis / Ph.D. Curriculum and Instruction 2011

Crescimento pós-traumático (CPT) refere-se à mudança positiva em algum aspecto da experiência humana como resultado do enfrentamento de situações adversas (traumáticas ou crises de vida em geral). O objetivo geral do presente trabalho foi investigar em uma amostra brasileira as propriedades psicométricas da Versão Brasileira do Inventário de Crescimento Pós-Traumático (Brazilian Version of the Posttraumatic Growth Inventory – PTGI-B), instrumento que se propõe a mensurar CPT. Para isso, dois estudos distintos foram realizados. O Estudo I buscou investigar a estrutural fatorial do PTGI-B. Participaram dele 321 pessoas que passaram por situações adversas variadas. A estrutura fatorial do PTGI-B foi investigada através do método de análise fatorial confirmatória. Testou-se cinco diferentes modelos de estrutura fatorial. A estrutura convencional de cinco fatores apresentou melhores índices de ajuste quando comparada às demais. Além disso, o modelo de cinco fatores de primeira ordem organizados em torno de um fator geral de segunda ordem também mostrou índices de ajuste adequados. O Estudo II buscou avaliar se as evidências de validade externa da Versão Brasileira do Inventário de Crescimento Pós-Traumático (PTGI-B) são mais consistentes quando se compara os resultados de um subgrupo pontuou alto na Escala de Centralidade de Eventos (ECE) versus os resultados do subgrupo que pontuou baixo na ECE - que avalia em que medida o evento de referência contribuiu na formação da identidade dos indivíduos. Participaram do estudo 317 pessoas que passaram por situações adversas variadas. Investigou-se a relação entre crescimento pós-traumático, suporte social, sentido de vida, satisfação com a vida, religiosidade e desajuste psicológico. As correlações entre CPT e as demais variáveis de interesse mostraram-se maiores e mais coerentes no subgrupo que pontuou alto na ECE do que no subgrupo que pontuou baixo. Os resultados obtidos fortalecem a concepção de que apenas eventos que levam a uma reavaliação das crenças centrais dos indivíduos devem ser incluídos nos estudos de CPT. / Posttraumatic growth (PTG) refers to the positive change in some aspect of the human experience as a result of facing adverse situations (traumatic or general life crisis). The main goal of the present study was to investigate the psychometric properties of the Brazilian Version of the Posttraumatic Growth Inventory (PTGI-B). To address this purpose, two distinct studies were performed. Study I was aimed to investigate the factor structure of the PTGI-B. It involved 321 people who had been through a wide range of adverse situations. The factorial structure of the PTGI was investigated using the method of confirmatory factorial analysis. Five different models of factorial structure were tested. The conventional five factor structure presented better adjustment indices when compared to the others. However, the factorial structure of five first order factors organized around a second order global PTG factor was also adequate. Study II intended to assess whether evidence of the external validity of the Brazilian Version of the Post Traumatic Growth Inventory (PTGI-B) is more consistent when considering the events in which individuals scored high versus individuals who scored low on the Centrality of Events Scale (ECE). The ECE assesses to what extent the reference event contributed to the formation of individuals' identity. A total of 317 people who had been through a variety of adverse events participated in the study. It was investigated the relationship between posttraumatic growth, social support, meaning in life, life satisfaction, religiosity and psychological distress. The correlations between PTGI-B scores and the other variables of interest became larger and more theoretically coherent in the subgroup that scored high in ECE than in the subgroup that scored low. The results obtained strengthen the conception that only events that lead to a reassessment of individuals’ central beliefs should be included in the PTG studies.

Crescimento pós-traumático (CPT) refere-se à mudança positiva em algum aspecto da experiência humana como resultado do enfrentamento de situações adversas (traumáticas ou crises de vida em geral). O objetivo geral do presente trabalho foi investigar em uma amostra brasileira as propriedades psicométricas da Versão Brasileira do Inventário de Crescimento Pós-Traumático (Brazilian Version of the Posttraumatic Growth Inventory – PTGI-B), instrumento que se propõe a mensurar CPT. Para isso, dois estudos distintos foram realizados. O Estudo I buscou investigar a estrutural fatorial do PTGI-B. Participaram dele 321 pessoas que passaram por situações adversas variadas. A estrutura fatorial do PTGI-B foi investigada através do método de análise fatorial confirmatória. Testou-se cinco diferentes modelos de estrutura fatorial. A estrutura convencional de cinco fatores apresentou melhores índices de ajuste quando comparada às demais. Além disso, o modelo de cinco fatores de primeira ordem organizados em torno de um fator geral de segunda ordem também mostrou índices de ajuste adequados. O Estudo II buscou avaliar se as evidências de validade externa da Versão Brasileira do Inventário de Crescimento Pós-Traumático (PTGI-B) são mais consistentes quando se compara os resultados de um subgrupo pontuou alto na Escala de Centralidade de Eventos (ECE) versus os resultados do subgrupo que pontuou baixo na ECE - que avalia em que medida o evento de referência contribuiu na formação da identidade dos indivíduos. Participaram do estudo 317 pessoas que passaram por situações adversas variadas. Investigou-se a relação entre crescimento pós-traumático, suporte social, sentido de vida, satisfação com a vida, religiosidade e desajuste psicológico. As correlações entre CPT e as demais variáveis de interesse mostraram-se maiores e mais coerentes no subgrupo que pontuou alto na ECE do que no subgrupo que pontuou baixo. Os resultados obtidos fortalecem a concepção de que apenas eventos que levam a uma reavaliação das crenças centrais dos indivíduos devem ser incluídos nos estudos de CPT. / Posttraumatic growth (PTG) refers to the positive change in some aspect of the human experience as a result of facing adverse situations (traumatic or general life crisis). The main goal of the present study was to investigate the psychometric properties of the Brazilian Version of the Posttraumatic Growth Inventory (PTGI-B). To address this purpose, two distinct studies were performed. Study I was aimed to investigate the factor structure of the PTGI-B. It involved 321 people who had been through a wide range of adverse situations. The factorial structure of the PTGI was investigated using the method of confirmatory factorial analysis. Five different models of factorial structure were tested. The conventional five factor structure presented better adjustment indices when compared to the others. However, the factorial structure of five first order factors organized around a second order global PTG factor was also adequate. Study II intended to assess whether evidence of the external validity of the Brazilian Version of the Post Traumatic Growth Inventory (PTGI-B) is more consistent when considering the events in which individuals scored high versus individuals who scored low on the Centrality of Events Scale (ECE). The ECE assesses to what extent the reference event contributed to the formation of individuals' identity. A total of 317 people who had been through a variety of adverse events participated in the study. It was investigated the relationship between posttraumatic growth, social support, meaning in life, life satisfaction, religiosity and psychological distress. The correlations between PTGI-B scores and the other variables of interest became larger and more theoretically coherent in the subgroup that scored high in ECE than in the subgroup that scored low. The results obtained strengthen the conception that only events that lead to a reassessment of individuals’ central beliefs should be included in the PTG studies.