Offering a unifying theoretical perspective not readily available in any other text, this innovative guide to econometrics uses simple geometrical arguments to develop students' intuitive understanding of basic and advanced topics, emphasizing throughout the practical applications of modern theory and nonlinear techniques of estimation. One theme of the text is the use of artificial regressions for estimation, reference, and specification testing of nonlinear models, including diagnostic tests for parameter constancy, serial correlation, heteroscedasticity, and other types of mis-specification. Explaining how estimates can be obtained and tests can be carried out, the authors go beyond a mere algebraic description to one that can be easily translated into the commands of a standard econometric software package. Covering an unprecedented range of problems with a consistent emphasis on those that arise in applied work, this accessible and coherent guide to the most vital topics in econometrics today is indispensable for advanced students of econometrics and students of statistics interested in regression and related topics. It will also suit practising econometricians who want to update their skills. Flexibly designed to accommodate a variety of course levels, it offers both complete coverage of the basic material and separate chapters on areas of specialized interest.

Estimation and Inference in Econometrics

The Art of Computer Systems Performance Analysis (Techniques for Experimental Design, Measurement, Simulation, and Modeling)

Probabilistic Timing Analysis (PTA) in general and its measurement-based variant called MBPTA in particular can mitigate some of the problems that impair current worst-case execution time (WCET) analysis techniques. MBPTA computes tight WCET bounds expressed as probabilistic exceedance functions, without needing much information on the hardware and software internals of the system. Classic WCET analysis has information needs that may be costly and difficult to satisfy, and their omission increases pessimism. Previous work has shown that MBPTA does well with benchmark programs. Real-world applications however place more demanding requirements on timing analysis than simple benchmarks. It is interesting to see how PTA responds to them. This paper discusses the application of MBPTA to a real avionics system and presents lessons learned in that process.

/pdf/measurement-based-probabilistic-timing-analysis-lessons-from-2a1110skt5.pdf

Measurement-based probabilistic timing analysis: Lessons from an integrated-modular avionics case study

Background More than 21 million Americans and nearly 20% of the U.S. workforce are shift workers. Non-standard shift work, defined as work that falls outside of 6 am –6 pm , can lead to poor diet, exercise, and sleep habits that lead to decreased productivity, increased workplace accidents, and a variety of negative health outcomes. Aim To investigate the associations between shift work exposure and chronic medical conditions such as metabolic syndromes, cardiovascular disease, gastrointestinal disturbances, and depression as well as urologic complications including hypogonadism, male infertility, lower urinary tract symptoms, and prostate cancer with a focus on the effects of shift work sleep disorder (SWSD) on the severity of these negative health outcomes. Methods We reviewed the literature examining effects of shift work and SWSD on general and urologic health. Outcomes We produced a summary of effects of shift work on health with focus on the increased risk of negative health outcomes in non-standard shift workers, particularly those with SWSD, when compared to daytime workers or workers without SWSD. Results Studies have associated non-standard shift work schedules and poor health outcomes, including increased risks of diabetes mellitus, dyslipidemia, hypertension, heart disease, peptic ulcer disease, and depression, in shift workers. However, few studies have focused on the role that shift work plays in men’s urologic health. Current evidence supports associations between non-standard shift work and increased hypogonadal symptoms, poor semen parameters, decreased fertility, lower urinary tract symptoms, and prostate cancer. These associations are strengthened by the presence of SWSD, which affects up to 20% of shift workers. Unfortunately, interventions, such as planned naps, timed light exposure, melatonin, and sedative hypnotics, aimed at alleviating excessive nighttime sleepiness and daytime insomnia in non-standard shift workers experiencing SWSD, are limited and lack strong evidence to support their efficacy. Conclusions Non-standard shift work has been associated with a variety of negative health outcomes and urologic complications, especially with concurrent SWSD. Recognition of these increased risks among shift workers can potentially aid in more effective screening of chronic health and urologic conditions. Non-pharmacologic treatment of SWSD focuses on behavioral therapy and sleep hygiene while melatonin, hypnotics, and stimulants are used to alleviate insomnia and excessive sleepiness of SWSD. Further research into both pharmacologic and non-pharmacologic therapies for SWSD is needed to establish more definitive guidelines in the treatment of SWSD in order to increase productivity, minimize workplace accidents, and improve quality of life for shift workers. Deng N, Kohn TP, Lipshultz LI, et al. The Relationship Between Shift Work and Men’s Health. Sex Med Rev 2018;6:446–456.

The Relationship Between Shift Work and Men's Health.

Previous studies on the influence of noise and acoustics in the classroom on voice symptoms among teachers have exclusively relied on self-reports. Since self-reported physical conditions may be biased, it is important to determine the role of objective measurements of noise and acoustics in the presence of voice symptoms. To assess the association between objectively measured and self-reported physical conditions at school with the presence of voice symptoms among teachers. In 12 public schools in Bogotα, we conducted a cross-sectional study among 682 Colombian school workers at 377 workplaces. After signed the informed consent, participants filled out a questionnaire on individual and work-related conditions and the nature and severity of voice symptoms in the past month. Short-term environmental measurements of sound levels, temperature, humidity, and reverberation time were conducted during visits at the workplaces, such as classrooms and offices. Logistic regression analysis was used to determine associations between work-related factors and voice symptoms. High noise levels outside schools (odds ratio [OR] = 1.83; 95% confidence interval [CI]: 1.12-2.99) and self-reported poor acoustics at the workplace (OR = 2.44; 95% CI: 1.88-3.53) were associated with voice symptoms. We found poor agreement between the objective measurements and self-reports of physical conditions at the workplace. This study indicates that noise and acoustics may play a role in the occurrence of voice symptoms among teachers. The poor agreement between objective measurements and self-reports of physical conditions indicate that these are different entities, which argue for inclusion of physical measurements of the working environment in studies on the influence of noise and acoustics on vocal health.

Effects of noise and acoustics in schools on vocal health in teachers.

OBJETIVO: Analisar fatores associados a prevalencia do diagnostico medico referido de patologias das pregas vocais em professores. METODOS: Estudo epidemiologico transversal, censitario, com 4.495 professores da rede publica municipal de ensino elementar e fundamental de Salvador, BA, de marco a abril de 2006. A variavel dependente foi o diagnostico medico referido de patologias das pregas vocais e as independentes, caracteristicas sociodemograficas, atividade profissional, organizacao do trabalho/relacoes interpessoais, caracteristicas fisicas do ambiente de trabalho, frequencia de transtornos mentais comuns, medida pelo Self-Reporting Questionnaire-20 (SRQ-20 >7) e condicoes de saude geral. Foram aplicadas tecnicas de analise estatistica descritiva, bivariada e regressao logistica multipla. RESULTADOS: A prevalencia de diagnostico medico referido de patologias das pregas vocais foi de 18,9%. Na analise de regressao logistica, as variaveis que permaneceram associadas ao diagnostico medico de patologia das pregas vocais foram: sexo feminino, trabalhar como professor por mais de sete anos, uso intensivo da voz, referir mais de cinco caracteristicas desfavoraveis do ambiente fisico de trabalho, uma ou mais doencas do trato respiratorio, perda auditiva e apresentar transtornos mentais comuns. CONCLUSOES: A presenca de patologias das pregas vocais referidas associou-se a fatores que indicam a necessidade de acoes de promocao da saude vocal do professor e modificacoes na organizacao e estrutura do trabalho docente.

https://www.scielosp.org/pdf/rsp/2011.v45n5/914-921

Fatores associados a patologias de pregas vocais em professores

OBJETIVO: Analizar factores asociados a la prevalencia del diagnostico medico referido de patologias de las cuerdas vocales en profesores. METODOS: Estudio epidemiologico transversal, censitario, con 4.495 profesores de la red publica municipal de ensenanza primaria y media de Salvador, Noreste de Brasil, de marzo a abril de 2006. La variable dependiente fue el diagnostico medico referido de patologias de las cuerdas vocales y las independientes, caracteristicas sociodemograficas, actividad profesional, organizacion del trabajo/relaciones interpersonales, caracteristicas fisicas del ambiente de trabajo, frecuencia de trastornos mentales comunes, medida por el Self-Reporting Questionnaire-20 (SRQ-20>7) y condiciones de salud general. Se aplicaron tecnicas de analisis estadistico descriptivo, bivariada y regresion logistica multiple. RESULTADOS: La prevalencia de diagnostico medico referido de patologias de las cuerdas vocales fue de 18,9%. En el analisis de regresion logistica, las variables que permanecieron asociadas al diagnostico medico de patologia de las cuerdas vocales fueron: sexo femenino, trabajar como profesor por mas de siete anos, uso intensivo de la voz, referir mas de cinco caracteristicas desfavorables del ambiente fisico de trabajo, una o mas enfermedades del tracto respiratorio, perdida auditiva, y presentar trastornos mentales comunes. CONCLUSIONES: La presencia de patologias de las cuerdas vocales referidas se asocio a factores que indican la necesidad de acciones de promocion de la salud vocal del profesor y modificaciones en la organizacion y estructura del trabajo docente.

/pdf/factores-asociados-a-patologias-de-cuerdas-vocales-en-18krq0gu2l.pdf

Factores asociados a patologías de cuerdas vocales en profesores

OBJETIVOS: Determinar indicadores do absenteismo por licenca medica (LM) em trabalhadores da area de servicos de uma industria de petroleo, identificando as patologias associadas. METODOS: Este estudo descreve resultados de estudo coorte retrospectivo com 782 trabalhadores de uma empresa de petroleo no periodo de 1o de janeiro de 2007 a 31 de dezembro de 2009. RESULTADOS: 542 trabalhadores tiveram eventos de faltas ao trabalho que geraram licenca medica. Registrou-se 3,3 episodios de LM por trabalhador e 69,3% dos trabalhadores tiveram pelo menos um episodio de LM. Os episodios de LM duraram em media 6,6 dias, com desvio padrao de 9,8 dias. A maior proporcao de episodios de absenteismo por LM deveu-se as doencas do sistema osteomuscular e tecido conjuntivo. Dezesseis dentre os 782 trabalhadores apresentaram 17 episodios de LM associadas ao trabalho (acidente tipico, de trajeto e doenca ocupacional). CONCLUSOES: O estudo ratificou a importância do afastamento por doencas do sistema osteomuscular e o impacto das doencas ocupacionais no absenteismo por licenca medica, detectando indices semelhantes ao da literatura, numa populacao pouco explorada do ponto de vista epidemiologico.

/pdf/indicadores-de-absenteismo-e-diagnosticos-associados-as-2gwnququ4g.pdf

Indicadores de absenteísmo e diagnósticos associados às licenças médicas de trabalhadores da área de serviços de uma indústria de petróleo

OBJECTIVE: To analyze factors associated with the prevalence of the medical diagnosis of vocal fold pathologies in teachers. METHODS: A census-based epidemiological, cross-sectional study was conducted with 4,495 public primary and secondary school teachers in the city of Salvador, Northeastern Brazil, between March and April 2006. The dependent variable was the self-reported medical diagnosis of vocal fold pathologies and the independent variables were sociodemographic characteristics; professional activity; work organization/interpersonal relationships; physical work environment characteristics; frequency of common mental disorders, measured by the Self-Reporting Questionnaire-20 (SRQ-20 ≥7); and general health conditions. Descriptive statistical, bivariate and multiple logistic regression analysis techniques were used. RESULTS: The prevalence of self-reported medical diagnosis of vocal fold pathologies was 18.9%. In the logistic regression analysis, the variables that remained associated with this medical diagnosis were as follows: being female, having worked as a teacher for more than seven years, excessive voice use, reporting more than ﬁ ve unfavorable physical work environment characteristics and presence of common mental disorders.

/pdf/fatores-associados-a-patologias-de-pregas-vocais-em-3ksb7yzvq8.pdf

Fatores associados a patologias de pregas vocais em professores Factors associated with vocal fold pathologies in teachers

OBJECTIVE: To analyze factors associated with the prevalence of the medical diagnosis of vocal fold pathologies in teachers. METHODS: A census-based epidemiological, cross-sectional study was conducted with 4,495 public primary and secondary school teachers in the city of Salvador, Northeastern Brazil, between March and April 2006. The dependent variable was the self-reported medical diagnosis of vocal fold pathologies and the independent variables were sociodemographic characteristics; professional activity; work organization/interpersonal relationships; physical work environment characteristics; frequency of common mental disorders, measured by the Self-Reporting Questionnaire-20 (SRQ-20 ≥7); and general health conditions. Descriptive statistical, bivariate and multiple logistic regression analysis techniques were used. RESULTS: The prevalence of self-reported medical diagnosis of vocal fold pathologies was 18.9%. In the logistic regression analysis, the variables that remained associated with this medical diagnosis were as follows: being female, having worked as a teacher for more than seven years, excessive voice use, reporting more than fi ve unfavorable physical work environment characteristics and presence of common mental disorders. CONCLUSIONS: The presence of self-reported vocal fold pathologies was associated with factors that point out the need of actions that promote teachers’ vocal health and changes in their work structure and organization.

/pdf/factors-associated-with-vocal-fold-pathologies-in-teachers-1bkxjf5zg6.pdf

Verônica Maria Cadena Lima

Papers

Fatores associados a patologias de pregas vocais em professores

Factores asociados a patologías de cuerdas vocales en profesores

Indicadores de absenteísmo e diagnósticos associados às licenças médicas de trabalhadores da área de serviços de uma indústria de petróleo

Fatores associados a patologias de pregas vocais em professores Factors associated with vocal fold pathologies in teachers

Factors associated with vocal fold pathologies in teachers.