Perception of eating practices and stages of change among Brazilian adolescents

Objective. To evaluate the perception of eating practices and the stages of change among adolescents. Methods. Cross-sectional study involving a representative sample of 390 adolescents from 11 public schools in the city of Piracicaba, Brazil, in 2004. Food consumption was identified by a food frequency questionnaire and the perception of eating practices evaluation was conducted by comparing food consumption and individual classification of healthy aspects of the diet. The participants were classified within stages of change by means of a specific algorithm. A reclassification within new stages of change was proposed to identify adolescents with similar characteristics regarding food consumption and perception. Results. Low consumption of fruit and vegetables and high consumption of sweets and fats were identified. More than 44% of the adolescents had a mistaken perception of their diet. A significant relationship between the stages of change and food consumption was observed. The reclassification among stages of change, through including the pseudo-maintenance and non-reflective action stages was necessary, considering the high proportion of adolescents who erroneously classified their diets as healthy. Conclusion. Classification of the adolescents into stages of change, together with consumption and perception data, enabled identification of groups at risk, in accordance with their inadequate dietary habits and non-recognition of such habits. (C) 2009 Elsevier Inc. All rights reserved.

Landscape perception by forest understory birds in the Atlantic Rainforest: black-and-white versus shades of grey

Even among forest specialists, species-specific responses to anthropogenic forest fragmentation may vary considerably. Some appear to be confined to forest interiors, and perceive a fragmented landscape as a mosaic of suitable fragments and hostile matrix. Others, however, are able to make use of matrix habitats and perceive the landscape in shades of grey rather than black-and-white. We analysed data of 42 Chiroxiphia caudata (Blue Manakin), 10 Pyriglena leucoptera (White-shouldered Fire-eye) and 19 Sclerurus scansor (Rufous-breasted Leaftosser) radio-tracked in the Atlantic Rainforest of Brazil between 2003 and 2005. We illustrate how habitat preferences may determine how species respond to or perceive the landscape structure. We compared available with used habitat to develop a species-specific preference index for each of six habitat classes. All three species preferred old forest, but relative use of other classes differed significantly. S. scansor perceived great contrast between old forest and matrix, whereas the other two species perceived greater habitat continuity. For conservation planning, our study offers three important messages: (1) some forest specialist species are able to persist in highly fragmented landscapes; (2) some forest species may be able to make use of different anthropogenic habitat types to various degrees; whereas (3) others are restricted to the remaining forest fragments. Our study suggests species most confined to forest interiors to be considered as potential umbrella species for landscape-scale conservation planning.

The perception of accessibility in Web development by academy, industry and government: a survey of the Brazilian scenario

Accessibility has become a serious issue to be considered by various sectors of the society. However, what are the differences between the perception of accessibility by academy, government and industry? In this paper, we present an analysis of this issue based on a large survey carried out with 613 participants involved with Web development, from all of the 27 Brazilian states. The paper presents results from the data analysis for each sector, along with statistical tests regarding the main different issues related to each of the sectors, such as: government and law, industry and techniques, academy and education. The concern about accessibility law is poor even amongst people from government sector. The analyses have also pointed out that the academy has not been addressing accessibility training accordingly. The knowledge about proper techniques to produce accessible contents is better than other sectors`, but still limited in industry. Stronger investments in training and in the promotion of consciousness about the law may be pointed as the most important tools to help a more effective policy on Web accessibility in Brazil.

Inferential Implications of Over-Parametrization: A Case Study in Incomplete Categorical Data

P>In the context of either Bayesian or classical sensitivity analyses of over-parametrized models for incomplete categorical data, it is well known that prior-dependence on posterior inferences of nonidentifiable parameters or that too parsimonious over-parametrized models may lead to erroneous conclusions. Nevertheless, some authors either pay no attention to which parameters are nonidentifiable or do not appropriately account for possible prior-dependence. We review the literature on this topic and consider simple examples to emphasize that in both inferential frameworks, the subjective components can influence results in nontrivial ways, irrespectively of the sample size. Specifically, we show that prior distributions commonly regarded as slightly informative or noninformative may actually be too informative for nonidentifiable parameters, and that the choice of over-parametrized models may drastically impact the results, suggesting that a careful examination of their effects should be considered before drawing conclusions.Resume Que ce soit dans un cadre Bayesien ou classique, il est bien connu que la surparametrisation, dans les modeles pour donnees categorielles incompletes, peut conduire a des conclusions erronees. Cependant, certains auteurs persistent a negliger les problemes lies a la presence de parametres non identifies. Nous passons en revue la litterature dans ce domaine, et considerons quelques exemples surparametres simples dans lesquels les elements subjectifs influencent de facon non negligeable les resultats, independamment de la taille des echantillons. Plus precisement, nous montrons comment des a priori consideres comme peu ou non-informatifs peuvent se reveler extremement informatifs en ce qui concerne les parametres non identifies, et que le recours a des modeles surparametres peut avoir sur les conclusions finales un impact considerable. Ceci suggere un examen tres attentif de l`impact potentiel des a priori.

Missing data mechanisms and their implications on the analysis of categorical data

We review some issues related to the implications of different missing data mechanisms on statistical inference for contingency tables and consider simulation studies to compare the results obtained under such models to those where the units with missing data are disregarded. We confirm that although, in general, analyses under the correct missing at random and missing completely at random models are more efficient even for small sample sizes, there are exceptions where they may not improve the results obtained by ignoring the partially classified data. We show that under the missing not at random (MNAR) model, estimates on the boundary of the parameter space as well as lack of identifiability of the parameters of saturated models may be associated with undesirable asymptotic properties of maximum likelihood estimators and likelihood ratio tests; even in standard cases the bias of the estimators may be low only for very large samples. We also show that the probability of a boundary solution obtained under the correct MNAR model may be large even for large samples and that, consequently, we may not always conclude that a MNAR model is misspecified because the estimate is on the boundary of the parameter space.

Praxis och perception : En studie av gymnasieelevers tolkning av två lärares undervisningsmetoder i historia

Syftet med detta arbete är att ta reda på i vilken utsträckning och på vilket sätt lärarens undervisningspraxis styr gymnasieelevers syn på historieämnet. I samband med att vedertagna uppfattningar om kunskap och kunskapsöverföring har utmanats inom pedagogisk forskning, har historieämnet alltmer kommit att definieras som ett instrument för självinsikt och förståelse för omvärlden. Den förändrade historiesynen medför nya typer av undervisningspraxis bland enskilda lärare, där till exempel kronologi och kanon får stå tillbaka för bland annat tematisk fördjupning och flerperspektivism.Undersökningen består av intervjuer med två gymnasieklasser och deras gymnasielärare. I intervjuerna fick lärarna och eleverna var för sig definiera momentet utifrån vad det handlade om, vilka målsättningar man haft, hur undervisningen gått till och vad övningarna syftat till.Resultaten visar att lärarnas respektive historiesyn och undervisningspraxis i mycket stor utsträckning präglar elevers perception av historieämnet. Elevernas normer och målsättningar i relation till historieundervisningen följde respektive lärares undervisningspraxis, utan att andra faktorer, som läromedel, i nämnvärd utsträckning spelade in. Läraren framstår därmed som den klart viktigaste auktoriteten för elevernas förståelse av historieämnet.

Hur påverka tyngden i mixen? : Från mixning till perception

Uppsatsen handlar om den subjektivt upplevda tyngden i musik. Avsikten med arbetet har varit att härleda ljudets fysiska egenskaper ur upplevelsen av tyngd och rörelse, och på det viset klargöra samband, vilka kan underlätta för förståelse och omsättning av kunskaperna i en praktisk mixningssituation. Detta har undersökts genom en sammanställning av litteratur, genom vilken kunskap om perception, psykoakustik och teknik har ordnats. Intentionen var att knyta samman perceptionsteori och psykoakustik med ljudteknik, för att följa fenomenet från upplevelse till teknisk påverkan. Av resultaten framkommer att tonhöjd och tonstyrka är avgörande för tyngdupplevelsen, och att de i någon mån kan påverkas med samtliga processorer som behandlas i arbetet.

Visuell Perception : En studie av visuella faktorer kring ett musikaliskt framträdande

The essay investigates the visual element as seen by the audience and artist to be of greatest importance to a musicalperformance. The study was conducted in the form of a field work which included doing interviews with artists, surveys of the audience and interpretive observations of live performance. The fieldwork was conducted in three different environments in which I found myself on the spot and performed the various stages included in the field work. It was done to create a surface that could be used in an essay, and through that use this material to compare and analyze my results and in the end be able to answer my questions. I started from eight different factors which all could beexperienced visually on stage. The factors were light / colors, costumes, props, effects, stage presence, attitude / image, nervousness and dance / body language. Those factors would then be examined in the various musical performances and to be answered by the audience and performers which of those factors they considered to be of great importance or small importance when it comes to visual perception in a musical context. The result was a clear statement where two factors were considered to be most crucial for a musical performance, and a clear statement in which two factors were considered by the majority to be less important. The results demonstrate a common understanding what the artist and the audience thinks is important. A result that can act as a template for what an artist should think about regarding the visual elements before an performance. My theory is my assumption that the visual elements of musical performances can play an important or decisive role, an assumption that was strengthened by my empirical experiences at a concert visit. I wanted in this essay explore and give a clear picture of what it is that artists and audiences consider to be visually crucial for a musical context

The priority of temporal aspects in L2-Swedish prosody : Studies in perception and production

Foreign accent can be everything from hardly detectable to rendering the second language speech unintelligible. It is assumed that certain aspects of a specific target language contribute more to making the foreign accented speech intelligible and listener friendly, than others. The present thesis examines a teaching strategy for Swedish pronunciation in second language education. The teaching strategy “Basic prosody” or BP, gives priority to temporal aspects of Swedish prosody, which means the temporal phonological contrasts word stress and quantity, as well as the durational realizations of these contrasts. BP does not prescribe any specific tonal realizations. This standpoint is based on the great regional variety in realization and distribution of Swedish word accents. The teaching strategy consists virtually of three directives: · Stress the proper word in the sentence. · Stress proper syllables in stressed words and make them longer. · Lengthen the proper segment – vowel or subsequent consonant – in the stressed syllable. These directives reflect the view that all phonological length is stress-induced, and that vowel length and consonant length are equally important as learning goals. BP is examined in the light of existing findings in the field of second language pronunciation and with respect to the phonetic correlates of Swedish stress and quantity. Five studies examine the relation between segment durations and the categorization made by native Swedish listeners. The results indicate that the postvocalic consonant duration contributes to quantity categorization as well as giving the proper duration to stressed syllables. Furthermore, native Swedish speakers are shown to apply the complementary /V: C/ - /VC:/ pattern also when speaking English and German, by lengthening postvocalic consonants. The correctness of the priority is not directly addressed but important aspects of BP are supported by earlier findings as well as the results from the present studies.

Influência da mudança organizacional na percepção dos papéis desempenhados no trabalho: o caso do arsenal de Marinha do Rio de Janeiro

O Objetivo desta pesquisa é analisar a influência da mudança organizacional sofrida pelo Arsenal de Marinha do Rio de Janeiro (AMRJ) sobre a percepção em relação aos papéis desempenhados pelos seus servidores, dos níveis gerencial e operacional, no que tange a valores e crenças sobre o seu trabalho. Esta pesquisa constitui um estudo de caso, e se deu por meio de pesquisa de campo, de cunho qualitativo, e por isso, os dados foram analisados de forma descritivo-interpretativa sobre a avaliação documental e do seu conteúdo. Os dados primários foram obtidos a partir de análise de documentos, tais como relatórios, normas, publicações e regulamentos internos; e os dados secundários foram provenientes de entrevistas semiestruturadas; e possibilitaram averiguar as categorias analíticas envolvidas na pesquisa. As amostras para as entrevistas foram selecionadas de populações, dentro do AMRJ que fossem semelhantes ou equivalentes a populações de indústrias privadas e os sujeitos das mesmas, que, igualmente, tivessem equivalência funcional em outras indústrias ou empresas a fim de serem representativas para a composição do conteúdo da pesquisa. Os dados coletados permitiram concluir que o AMRJ ainda se encontra em processo de acomodação à mudança que se iniciou, e que o trabalho passou a ser mais gratificante para o nível gerencial, assumindo uma perspectiva de desafio e crescimento profissional a partir de um novo enfoque dado a ele, porém, para o nível operacional, devido a uma motivação decrescente e a interesses frustrados, sua percepção considera o trabalho como menos gratificante que o outro nível, apesar do sentimento positivo que tem pela instituição. Concluiu-se, também, que as mudanças são necessárias, apesar das dificuldades inerentes a ela, e influenciam a percepção das pessoas, mas podem ficar comprometidas caso não seja levado em conta que deve haver uma equivalência na distribuição, entre todos os níveis, dos benefícios que podem favorecê-la.

Hope, risk perception and propensity to indebtedness

Hope is an important construct in marketing, once it is an antecedent of important marketing variables, such as trust, expectation and satisfaction (MacInnis & de Mello, 2005, Almeida, Mazzon & Botelho, 2007). Specifically, the literature suggests that hope can play an important influence on risk perception (Almeida, 2010, Almeida et al., 2007, Fleming, 2008, MacInnis & de Mello, 2005) and propensity to indebtedness (Fleming, 2008). Thus, this thesis aims to investigate the relations among hope, risk perception related to purchasing and consumption and propensity to indebtedness, by reviewing the existing literature and conducting two empirical researches. The first of them is a laboratory experiment, which accessed hope and risk perception of getting a mortgage loan. The second is a survey, investigating university students’ propensity to get indebted to pay for their university tuition, analyzed through the method of Structural Equations Modeling (SEM). These studies found that hope seems to play an important role on propensity to indebtedness, as higher levels of hope predicted an increase in the propensity to accept the mortgage loan, independent of actual risks, and an increase in the propensity of college students to get indebted to pay for their studies. In addition, the first study suggests that hope may lead to a decrease in risk perception, which, however, has not been confirmed by the second study. Finally, this research offers some methodological contributions, due to the fact that it is the first study using an experimental method to study hope in Brazil and, worldwide, it is the first study investigating the relation among hope, risk perception and propensity to indebtedness, which proved to be important influences in consumer behavior