abstract: Lower representation of women in the engineering and computer science workforce is a global problem. In the United States, women in engineering drop out at a rate higher than their male counterparts. The male/female ratio in the engineering workforce has remained stagnant despite growing percentages of graduates. Women dropout due to familial responsibilities and they leave to take positions in other industries. In India, women are also employed at a lower rate than men. Many studies address the reasons why women leave, but few studies address why they stay. Those that do, address the personal and organizational characteristics that enable women to persist. Little research was found regarding the social supports that further women's ability to persist in the male-dominated field of engineering. This study surveyed 173 men and women engineers in the United States and India as well as collected qualitative data. The research focused on the social supports of family, friends, a special person, supervisors, coworkers, and professional networking, to determine how they support engineering persistence in the four demographics. The participants were scored on their level of persistence and the impact of social supports was evaluated against it. All supports were significant, although not for all demographics. Social supports of family, friends and a special person were more important to the sample of engineers from India, a collectivist culture. The importance of the supervisor relationship to women in the United States was reaffirmed. Professional networking, informal or formal, was the only support significantly related to persistence across all demographics. In the qualitative data there was a strong theme; coworkers are their friends and they support them in their engineering life. As companies re-think their organizational environment and attempt to change engineering culture and long-standing attitudes, women can engage in creating strong social supports and assist in building quality professional networking opportunities. A strong web of support strengthens a woman engineer’s ability to persist during difficult times and provides them opportunities for personal and career growth. It can also be a vehicle for furthering diversity and inclusion in their organizations. / Dissertation/Thesis / Masters Thesis Engineering 2016

abstract: Using a simple $SI$ infection model, I uncover the overall dynamics of the system and how they depend on the incidence function. I consider both an epidemic and endemic perspective of the model, but in both cases, three classes of incidence functions are identified. In the epidemic form, power incidences, where the infective portion $I^p$ has $p\in(0,1)$, cause unconditional host extinction, homogeneous incidences have host extinction for certain parameter constellations and host survival for others, and upper density-dependent incidences never cause host extinction. The case of non-extinction in upper density-dependent incidences extends to the case where a latent period is included. Using data from experiments with rhanavirus and salamanders, maximum likelihood estimates are applied to the data. With these estimates, I generate the corrected Akaike information criteria, which reward a low likelihood and punish the use of more parameters. This generates the Akaike weight, which is used to fit parameters to the data, and determine which incidence functions fit the data the best. From an endemic perspective, I observe that power incidences cause initial condition dependent host extinction for some parameter constellations and global stability for others, homogeneous incidences have host extinction for certain parameter constellations and host survival for others, and upper density-dependent incidences never cause host extinction. The dynamics when the incidence function is homogeneous are deeply explored. I expand the endemic considerations in the homogeneous case by adding a predator into the model. Using persistence theory, I show the conditions for the persistence of each of the predator, prey, and parasite species. Potential dynamics of the system include parasite mediated persistence of the predator, survival of the ecosystem at high initial predator levels and ecosystem collapse at low initial predator levels, persistence of all three species, and much more. / Dissertation/Thesis / Doctoral Dissertation Mathematics 2017

abstract: Native American students often enter postsecondary education as means of serving a broader community. Studies among a broad base of tribes found that the desire to serve a larger community acts as a motivation to persist through college. However, institutions of higher education often center on individualistic empowerment rather than focusing on how to empower tribal communities. Due to the lack of quality datasets that lend to quantitative research, our understanding of factors related to American Indian/Alaska Native (AI/AN) postsecondary persistence has primarily been based on qualitative studies The purpose of this study is to understand how the desire to serve a larger community influences current and former Cocopah and Quechan undergraduate students’ college persistence. The study adds to the Native American postsecondary persistence literature base, that up till now, has not quantitatively examined students’ desire to serve a larger community as a persistence factor while intentionally sampling two smaller tribes with tribal enrollments less than four thousand. This dissertation presents a Native American persistence model and alternative method of sampling small Indigenous nations, establishes construct validity for an instrument measuring the proposed persistence model and provides evidence the proposed model predicts postsecondary persistence and academic performance. The design of the model derives from a review theories and scholarship on Native American persistence. Subsequently, construction of an instrument measuring the model emerged from the theories, literature, expert feedback, and pilot testing. Using data collected from an online survey of a sample of Cocopah and Quechan students (n=117), the study provides evidence of construct validity of the instrument through an exploratory factor analysis. Following the instrument validation, regression analyses indicates that AI/AN postsecondary persistence within both two-year and four-year institutions is positively associated with student desire to give back. The evidence further suggests that researchers, practitioners, and administrators should expand programs that center on nation-building to increase the persistence of Native American students while simultaneously meeting the needs of tribal nations. / Dissertation/Thesis / Doctoral Dissertation Educational Policy and Evaluation 2018

abstract: To meet the increasing demands for more STEM graduates, United States (U.S.) higher education institutions need to support the retention of minoritized populations, such as first-generation Latinas studying engineering. The theories influencing this study included critical race theory, the theory of validation, and community cultural wealth. Current advising practices, when viewed through a critical race theory lens, reinforce deficit viewpoints about students and reinforce color-blind ideologies. As such, current practices will fail to support first-generation Latina student persistence in engineering. A 10-week long study was conducted on validating advising practices. The advisors for the study were purposefully selected while the students were selected via a stratified sampling approach. Validating advising practices were designed to elicit student stories and explored the ways in which advisors validated or invalidated the students. Qualitative data were collected from interviews and reflections. Thematic analysis was conducted to study the influence of the validating advising practices. Results indicate each advisor acted as a different type of validating “agent” executing her practices described along a continuum of validating to invalidating practices. The students described their advisors’ practices along a continuum of prescriptive to developmental to transformational advising. While advisors began the study expressing deficit viewpoints of first-generation Latinas, the students shared multiple forms of navigational, social, aspirational, and informational capital. Those advisors who employed developmental and transformational practices recognized and drew upon those assets during their deployment of validating advising practices, thus leading to validation within the advising interactions. / Dissertation/Thesis / Doctoral Dissertation Educational Leadership and Policy Studies 2018

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Contagious ecthyma, also known as orf, is an infectious disease of sheep and goats caused by orf virus (ORFV), the prototype of the genus Parapoxvirus (PPV) of the family Poxviridae. Current vaccines against the disease contain virulent virus, are empirically produced through skin scarification of live lambs and present questionable efficacy. Likewise, the epidemiology of the infection, especially the mechanisms used by the virus to be perpetuated in herds and possible genetic and antigenic variations are poorly understood. Thus, the objectives of this study were: a. Development and efficacy testing of a vaccine produced in tissue culture; b. Investigation of viral persistence in experimentally infected lambs and, c. Phylogenetic analysis of Brazilian strains. Chapter 1 describes the development and testing of a ORFV vaccine produced in tissue culture. For this, ORFV strain IA-82 was submitted to 21 passages in BHK-21 cells and used to immunize lambs (n=30) through skin scarification of the internal face of the hind limb. Vaccination produced localized pustules and scabs lesions in 16 out of 30 animals, indicating an adequate replication of the vaccine virus. Ninety days after vaccination, vaccinated (n=16) and control lambs (n=16) were inoculated with a virulent ORFV strain in the labial commissure. Vaccinated and control lambs developed typical orf lesions, characterized by hyperemia, vesicles, pustules and scab formation. Nonetheless, vaccinated animals developed milder lesions compared to controls and the clinical scores were significantly lower (p<0.05) between days 10 and 22 post-challenge. In addition, the mean duration of clinical disease was significantly reduced in vaccinated animals (p<0.05). Furthermore, vaccinated animals excreted much less virus (p<0.05) and for a significantly shorter period of time than did the controls (13.4 days versus 22.6 days, p<0.001). These results demonstrate partial protection by the experimental vaccine and, upon improvement of immunization and protection indices, are promising towards the use of tissue culture-based ORFV vaccines. Chapter 2 presents the investigation of ORFV persistence in experimentally infected lambs. For this, infected lambs were monitored for virus and viral DNA at different intervals after infection. Concomitantly, virus viability in scabs maintained at environmental temperatures was monitored. During acute infection, virus produced typical lesions of ecthyma in all inoculated lambs (n=10), with lesions during over 22 days. Infectious virus was recovered from lesions in titers up to 105.5 TCID50/ml, with peaks of virus excretion between days 10 and 12 post inoculation (pi). The virus was detected continuously in lesions of all animals up to day 24 pi; four lambs shed virus until day 44 pi and one up to day 51 pi. Viral DNA was detected by PCR in all skin biopsies up to day 37 pi, in four animals at day 51, in three animals at day 65 and one at day 79 pi. Infectious virus was detected in scabs maintained under environmental temperatures for up to 6 months. These results demonstrate that ORFV may be maintained and excreted for a long period by infected animals. Chapter 3 presents the sequence analysis of the major envelope glycoprotein gene (B2L) of nine Brazilian ORFV strains from sheep and goats obtained between 2008 and 2011 and three vaccine strains. Comparative sequence analysis revealed that Brazilian strains were highly related among themselves and with vaccine strains. Brazilian strains shared 97.7- 100% and 96.1-100% sequence identity of nucleotides and amino acids, respectively. With vaccine strains, Brazilian ORFVs showed 98.7-100% nucleotide identity and 97.7-100% amino acid similarity. Phylogenetic analysis based on deduced amino acid sequences showed that the Brazilian strains from sheep and vaccine strains clustered in the same branches; goat strains clustered into a separate branch. In summary, the obtained results contribute to the knowledge about the ORFV biology and epidemiology and are promising towards the use of a tissue culture based vaccine. / O ectima contagioso, também conhecido como Orf, é uma enfermidade contagiosa que afeta principalmente ovinos e caprinos e que está mundialmente distribuída. O agente da enfermidade, vírus do Orf (ORFV), é o protótipo do gênero Parapoxvirus (PPV), família Poxviridae. As vacinas atuais contra a doença apresentam eficácia questionável e são produzidas por métodos cruentos. Da mesma forma, a epidemiologia da infecção, especialmente os mecanismos utilizados pelo vírus para se perpetuar nos rebanhos e as suas possíveis variações genéticas e antigênicas são pouco conhecidas. Assim, os objetivos do presente trabalho foram: a. Desenvolvimento e teste de eficácia de uma vacina para o ORFV produzida em cultivo celular, b. Investigação da persistência viral em ovinos infectados experimentalmente, c. Análise filogenética de amostras brasileiras. O capítulo 1 relata a produção e teste de eficácia de uma vacina produzida em cultivo celular. Para isto, a cepa IA- 82 do ORFV foi submetida a 21 passagens em cultivo de células BHK-21 e usada para vacinar ovinos jovens (n=30), por escarificação cutânea na face interna da coxa. A vacinação produziu pústulas e crostas em 16 dos 30 ovinos vacinados, indicando imunização adequada em 53% dos animais. Noventa dias após a vacinação, ovinos vacinados (n=16) e controles (n=16) foram inoculados com uma cepa virulenta do ORFV (106,9DICC50/mL) após escarificação na comissura labial. Todos os animais desenvolveram lesões típicas de ectima, incluindo hiperemia, vesículas, pústulas e crostas. No entanto, os animais vacinados desenvolveram lesões mais leves e passageiras do que os controles, e os escores clínicos foram estatisticamente diferentes (p<0,05) entre os dias 10 e 22 pós-desafio. Além disso, o tempo de duração da doença foi significativamente inferior (p<0,05) nos animais vacinados. Os animais vacinados também excretaram menor quantidade de vírus (p<0,05) e por um período significativamente mais curto do que os controles (13,4 dias versus 22,6 dias, p<0,001). Esses resultados demonstram a proteção parcial conferida pela vacina experimental e, dependendo da melhoria dos índices de imunização e proteção, são promissores no sentido da utilização de vacinas contra o ORFV produzidas em cultivo celular. O capítulo 2 relata a investigação da persistência do ORFV em ovinos infectados experimentalmente. Para isto, ovinos inoculados com a cepa IA-82 foram submetidos a pesquisa de vírus e de DNA nas lesões a diferentes intervalos após a inoculação. A viabilidade do vírus também foi investigada em crostas de animais infectados mantidas à temperatura ambiente. Durante a infecção aguda, o vírus produziu lesões típicas de ectima em todos os animais inoculados (n=10), com duração de aproximadamente 22 dias. O vírus foi detectado continuamente nas lesões de todos os animais até o dia 24 pós inoculação (pi); quatro animais excretaram vírus até o dia 44 pi e um deles ainda excretava vírus no dia 51 pi. O vírus foi excretado em títulos de até 105,5 DICC50/ml, com picos de excreção viral entre os dias 10 e 12 pi. O DNA viral foi detectado por PCR em biópsias coletadas de todos os animais no dia 37 pi, e em um animal o DNA viral foi detectado até o dia 79 pi. O vírus foi recuperado, por isolamento viral, nas crostas mantidas a temperatura ambiente por até seis meses após a coleta. Esses resultados demonstram que o ORFV pode persistir e ser excretado por longo período em animais infectados, mesmo após a resolução clínica das lesões. O capítulo 3 relata a análise filogenética de nove amostras brasileiras de ORFV obtidas de ovinos e caprinos entre 2008 e 2011, além de três cepas vacinais. A sequência parcial do gene B2L, que codifica para uma proteína de envelope altamente imunogência, foi amplificada por PCR e o fragmento gerado (594 bp) foi submetido ao sequenciamento. A análise das sequências revelou que as amostras brasileiras possuem um alto grau de similaridade, quando comparados entre si e com as cepas vacinais. As amostras brasileiras apresentaram um grau de similaridade de nucleotídeos de 97, 7 a 100% e de aminoácidos de 96,1 a 100%. Quando comparadas com as cepas vacinais, as amostras analisadas apresentaram um grau de similaridade de nucleotídeos de 98,7 a 100% e de aminoácidos de 97,7 a 100%. A análise filogenética baseada na sequência deduzida de aminoácidos mostrou que as amostras de ovinos se agruparam junto com as cepas vacinais, e as amostras de caprinos se agruparam separadamente. Conjuntamente, esses resultados contribuem para o conhecimento acerca da biologia e epidemiologia do ORFV, e são promissores no sentido do uso de vacinas produzidas em cultivo celular.

Made available in DSpace on 2015-05-08T14:44:51Z (GMT). No. of bitstreams: 1 ArquivoTotal.pdf: 1688231 bytes, checksum: 1ccf6a24a76e04918e94f5df4d1edec9 (MD5) Previous issue date: 2013-03-20 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This study investigates unemployment dynamics behavior in Brazil focusing in its level of persistence. For this purpose, fractional integration models and a persistence change test are used. The results indicate that the unemployment rate have two different levels of persistence. The first one is a nonstationary, whereas the second one is a nonstationary but mean-reverting. From a nonlinear model with multiple regimes proposed by Faria and Leon-Ledesma (2008), an empirical approach was applied using a SETAR model, which allowed explaining the persistence shift by labor market institutions changes introduced by the 1988 Constitution. Based on these findings, was possible to relate the results with those obtained by Figueiredo (2010) and Estevão and Carvalho Filho (2012). It was concluded that there are evidences of a relationship between the level of persistence and institutions, but also that the upward trend in informality in the 1990s, by promote a reduction of market rigidities, may explain the persistence decrease. / Este estudo analisou o comportamento dinâmico da taxa de desemprego brasileiro focando no nível de persistência da série. Com esse propósito foram utilizados em um primeiro momento modelos de integração fracionária, além de testes de mudança de persistência da série. Os resultados indicaram que a taxa de desemprego possui dois diferentes níveis de persistência. No primeiro, a série é não estacionária, enquanto que no segundo não estacionária, mas com reversão à média. A partir de um modelo não linear com múltiplos regimes desenvolvido por Faria e León-Ledesma (2008), foi aplicada uma abordagem empírica com uso de um modelo SETAR, que permitiu explicar essas mudanças a partir de alterações das instituições do mercado de trabalho introduzidas com a nova Constituição de 1988. Diante dessas evidências foi possível relacionar esses resultados com os obtidos por Figueiredo (2010) e Estevão e Carvalho Filho (2012). A conclusão é de que não apenas há indícios de uma relação entre o nível de persistência e as instituições, como também de que a trajetória ascendente da informalidade nos anos 1990, ao promover uma redução de rigidez do mercado, pode explicar a redução da persistência agregada.

Made available in DSpace on 2015-05-08T14:44:55Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 831347 bytes, checksum: 813665eb658f12f32b26933a2a0c2799 (MD5) Previous issue date: 2012-11-30 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This work approaches two topics related to income distribution. First, we measure the level of justice associated to income distribution in Latin American countries. The analysis is based on the calculation of the unfair inequality before and after taxing. The results showed that the taxing system in such countries does not have any impact on the level of distributive justice. In this context, we highlight Brazil and Colombia. Secondly, we look into the persistence of poverty in Brazilian states. The empirical analysis is carried out in order to avoid bias related to the presence of outliers and the fallacy of Galton. Results showed that, contrary to what is currently exposed, the persistence level of poverty in Brazil is high. / Esta dissertação aborda dois temas relacionados à distribuição de renda. Estes temas apresentam-se em dois ensaios. No primeiro mensura-se o nível de justiça associado ao sistema de redistribuição de renda dos países latino americanos. A análise se baseia no cálculo da desigualdade injusta pré e pós taxação. Os resultados indicaram que o sistema de tributação desses países não possui impacto sobre o nível de justiça distributiva. Neste contexto, destacam-se, negativamente, Brasil e Colômbia. O segundo ensaio aborda a persistência da pobreza nos Estados brasileiros. A análise empírica é conduzida de forma a evitar vieses relacionados à presença de outliers e de falácia de Galton. Os resultados demonstram que, ao contrário do que postula a literatura atual, o nível de persistência da pobreza brasileira é elevado.

Made available in DSpace on 2014-12-17T14:20:03Z (GMT). No. of bitstreams: 1 AngeloFCV_DISSERT.pdf: 529844 bytes, checksum: 31ec92a2d3087f97d485f9b59c041809 (MD5) Previous issue date: 2011-06-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / A presente pesquisa visa entender os fatores que explicam a manuten??o dos aspectos artesanais no extrativismo da cera de carna?ba em Limoeiro do Norte. Justificamos a explora??o desse tema pelo fasc?nio do autor pelo tema e por ser esse recurso ainda uma importante fonte de renda para produtores e trabalhadores rurais no respectivo munic?pio. Objetivamos nessa pesquisa identificar as raz?es pelas quais a atividade mant?m seu padr?o tecnol?gico intacto. Primeiro objetivamos uma descri??o do processo produtivo da cera, tanto no passado, quanto no presente, comparando estes momentos e ressaltando o car?ter artesanal da atividade, al?m de analisar a import?ncia atual da atividade para aqueles que ainda lidam com esse tipo de produ??o, bem como procuramos revelar estrutura hist?rica e institucional que permeia a l?gica e as escolhas destes produtores, a qual pode explicar a preserva??o destes aspectos artesanais. Utilizando o referencial te?rico do institucionalismo, explicamos que a preserva??o destes aspectos artesanais, ocorre em virtude da preval?ncia de determinadas institui??es, como a mem?ria coletiva cultivada entre os rendeiros idosos e resistentes, a concentra??o fundi?ria, respons?vel pelo arrendamento e tamb?m as restritas possibilidades de investimento e poupan?a no processo produtivo, em face do baixo n?vel de renda de produtores, os quais com um produto pouco competitivo no mercado, pouco podem fazer para inovar tecnologicamente. / A presente pesquisa visa entender os fatores que explicam a manuten??o dos aspectos artesanais no extrativismo da cera de carna?ba em Limoeiro do Norte. Justificamos a explora??o desse tema pelo fasc?nio do autor pelo tema e por ser esse recurso ainda uma importante fonte de renda para produtores e trabalhadores rurais no respectivo munic?pio. Objetivamos nessa pesquisa identificar as raz?es pelas quais a atividade mant?m seu padr?o tecnol?gico intacto. Primeiro objetivamos uma descri??o do processo produtivo da cera, tanto no passado, quanto no presente, comparando estes momentos e ressaltando o car?ter artesanal da atividade, al?m de analisar a import?ncia atual da atividade para aqueles que ainda lidam com esse tipo de produ??o, bem como procuramos revelar estrutura hist?rica e institucional que permeia a l?gica e as escolhas destes produtores, a qual pode explicar a preserva??o destes aspectos artesanais. Utilizando o referencial te?rico do institucionalismo, explicamos que a preserva??o destes aspectos artesanais, ocorre em virtude da preval?ncia de determinadas institui??es, como a mem?ria coletiva cultivada entre os rendeiros idosos e resistentes, a concentra??o fundi?ria, respons?vel pelo arrendamento e tamb?m as restritas possibilidades de investimento e poupan?a no processo produtivo, em face do baixo n?vel de renda de produtores, os quais com um produto pouco competitivo no mercado, pouco podem fazer para inovar tecnologicamente.

Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Information Technology In the Faculty of Informatics and Design at the Cape Peninsula University of Technology / Data sources often emerge with the potential to transform, drive and allow deriving never-envisaged business value. These data sources change the way business enacts and models value generation. As a result, sellers are compelled to capture value by collecting data about business elements that drive change. Some of these elements, such as the customer and products, generate data as part of transactions which necessitates placement of the business element at the centre of the organisation’s data curation journey. This is in order to reveal changes and how these elements affect the business model. Data in business represents information translated into a format convenient for transfer. Data holds the relevant markers needed to measure business elements and provide the relevant metrics to monitor, steer and forecast business to attain enterprise goals. Data forms the building blocks of information within an organisation, allowing for knowledge and facts to be obtained. At its lowest level of abstraction, it provides a platform from which insights and knowledge can be derived as a direct extract for business decision-making as these decisions steer business into profitable situations. Because of this, organisations have had to adapt or change their business models to derive business value for sustainability, profitability and transformation. An organisation’s business model reflects a conceptual representation on how the organisation obtains and delivers value to prospective customers (the service beneficiary). In the process of delivering value to the service beneficiaries, data is generated. Generated data leads to business knowledge which can be leveraged to re-engineer the business model. The business model dictates which information and technology assets are needed for a balanced, profitable and optimised operation. The information assets represent value holding documented facts. Information assets go hand in hand with technology assets. The technology assets within an organisation are the technologies (computers, communications and databases) that support the automation of well-defined tasks as the organisation seeks to remain relevant to its clientele. What has become apparent is the fact that companies find it difficult to leverage the opportunities that data, and for that matter Big Data (BD), offers them. A data curation journey enables a seller to strategise and collect insightful data to influence how business may be conducted in a sustainable and profitable way while positioning the curating firm in a state of ‘information advantage’. While much of the discussion surrounding the concept of BD has focused on programming models (such as Hadoop) and technology innovations usually referred to as disruptive technologies (such as The Internet of Things and Automation of Knowledge Work), the real driver of technology and business is BD economics, which is the combination of open source data management and advanced analytics software coupled with commodity-based, scale-out architectures which are comparatively cheaper than prevalent sustainable technologies known to industry. Hadoop, though hugely misconstrued, is not an integration platform; it is a model the helps determine data value while it brings on-board an optimised way of curating data cheaply as part of the integration architecture. The objectives of the study were to explore how BD can be used to utilise the opportunities it offers the organisation, such as leveraging insights to enable business for transformation. This is accomplished by assessing the level of BD integration with the business model using the BD Business Model Maturation Index. Guidelines with subsequent recommendations are proposed for curation procedures aimed at improving the curation process. A qualitative research methodology was adopted. The research design outlines the research as a single case study; it outlines the philosophy as interpretivist, the approach as data collection through interviews, and the strategy as a review of the method of analysis deployed in the study. Themes that emerged from categorised data indicate the diverging of business elements into primary business elements and secondary supporting business elements. Furthermore, results show that data curation still hinges firmly on traditional data curation processes which diminish the benefits associated with BD curation. Results suggest a guided data curation process optimised by persistence hybridisation as an enabler to gain information advantage. The research also evaluated the level of integration of BD into the case business model to extrapolate results leading to guidelines and recommendations for BD curation.

O presente trabalho realizou uma aplicação empírica do modelo de Ohlson (1995) para as principais empresas brasileiras listadas na BM&FBovespa no período de 1996 a 2010, buscando verificar a consistência do modelo na previsão dos preços das ações. Dado que o método para utilização deste modelo é divergente na literatura, para este estudo decidiu-se pela metodologia de dados em painel, a qual considera tanto as características individuais de cada empresa, quanto à fatores específicos de determinados períodos. Foram desenvolvidos dois testes empíricos para o modelo, um para a função de preço e outro para a função de retorno. Os resultados encontrados mostraram que o modelo foi rejeitado no mercado de capitais brasileiro para as duas funções. / This paper conducted an empirical application of the Ohlson model (1995) for the main Brazilian companies listed on the BM&FBovespa in the period 1996-2010, in order to verify the consistency of the model in predicting stock prices. Since the method for using this model is divergent in the literature, it was decided the use of panel data methodology for this study, which considers both, the individual characteristics of each company and the specific factors for certain periods. It was developed two empirical tests for the model, one for the price function and another for the return function. The results showed that the model was rejected in the Brazilian capital market for both functions.