Search results for "SAMPLE"
showing 10 items of 2270 documents
An evaluation of the microscopical counting methods of the tape in hirst-burkard pollen and spore trap
1981
Abstract Three different sampling units in current use and different sampling strategies were tested. Randomly placed microscope fields are good in estimating the daily mean concentration, but very big sample size is needed. Traverses across the slide in systematic order are best to estimate the shortterm concentrations and diurnal variation. A formula for the estimation of the error in one transverse traverse is given. Twelve transverse traverses in systematic order is also enough to estimate the daily mean concentration. One or two traverses along the length of the slide give often unreliable estimates because of the irregularities in the transverse variation of the particle concentration…
Hypothesis testing for Panels of Semi-Markov Processes with parametric sojourn time distributions
2022
This work deals with the asymptotic properties of maximum likelihood estimators for semi-Markov processes with parametric sojourn time distributions. It is motivated by the comparison, via a two-sample test procedure, of the distribution of two panels of qualitative trajectories modeled by semi-Markov processes and observed over a random number of transitions. Considering first one panel of growing size, we derive, under classical conditions, the convergence in probability of the estimators of the transition probabilities and the parameters of the sojourn time distributions as well as their asymptotic normality. We then consider panels of semi-Markov processes drawn from two different popul…
Between politics and business: Boardroom decision making in state‐owned Indonesian enterprises
2019
Research Question/Issue. A significant part of the world's economy is controlled by state‐owned enterprises, and there is a lack of research on how the interplay between politics and business plays out in the boardroom. We address this issue by analyzing boardrooms' decision outcomes as they relate to the role of boardroom power distribution, members' motivation, and decision‐making approach. Research Findings/Insights. On the basis of information from a sample of 22 state‐owned Indonesian enterprises, we found that a decision outcome in a boardroom is influenced by three factors: the motivation and decision‐making approach of individual board members and the distribution of power in the bo…
Incidencia de factores personales y contextuales sobre el uso de los recursos tecnológicos por el alumnado en América Latina
2021
El uso de las tecnologías de la información y de la comunicación (TIC) por parte de alumnado refleja si el proceso de integración es apropiado. No obstante, la tipología de uso de las TIC en el alumnado no se ha establecido de forma empírica en función de su uso en casa y el centro educativo. Así, el propósito del artículo es determinar la estructura del uso de las TIC por parte del alumnado, junto con la influencia de factores personales y contextuales. Se ha empleado un diseño correlacional, siendo la muestra el alumnado de sexto curso de América Latina que ha respondido al cuestionario sobre uso de las TIC en el Tercer Estudio Regional Comparativo y Explicativo (TERCE). El análisis de da…
COVID-19 Profit Warnings: Delivering Bad News in a Time of Crisis
2022
Abstract Profit warnings (large negative earnings surprises) are important corporate reporting documents for delivering bad news and a distinctive corporate communication genre. The 2020 COVID-19 exogenous shock provides a unique worldwide crisis context for company disclosure of bad news. The research develops a genre-based typology/analytical framework for assessing COVID-19 profit warnings’ quality comprising: (1) Four profit warning/forecast quality characteristics and (2) Eight profit warning/forecast disclosures. For a sample of 160 profit-warning documents, the research manually analyses their content, culminating in a disclosure quality score/index. The research tests a model of the…
Exploring management control system typologies : an organisation-level view
2020
PurposeManagement controls are the processes and mechanisms managers use to influence the behaviour of individuals and groups towards the organisation’s objectives and goals. Discrete management controls and management control system (MCS) frameworks have been extensively researched, but there is little research on organisation-level MCS types. This study aims to identify organisation-level MCS types.Design/methodology/approachThis study draws on the MCS type literature, the competing values framework and the upper echelons theory to form organisation effectiveness and top management team constructs to characterise firms. Cluster analysis was used to group a sample of 318 firm-years into MC…
Effects of Retail Innovation and Image on “Value-Satisfaction-Loyalty” Chain
2017
There has been a particular focus on research into the links between value, satisfaction, and loyalty in services in recent years. In this context, we have selected image as a key strategic retailing tool and retail innovation because it is a new line of investigation with interesting challenges. This work deals with the study of these two antecedents in the “value→satisfaction→loyalty” chain. We approach the individual perspective considering the self-oriented values of Holbrook (Consumer value. A framework for analysis and research. Routledge, London, 1999) as an appropriate typology for research into retailing experiences. Therefore we aim to analyze the effect of image and innovation on…
Consumer behavior in a religious event experience: an empirical assessment of value dimensionality among volunteers
2009
PurposeThe purpose of this paper is to present volunteering in tourism events as a sort of spontaneous community participation that has far‐reaching consequences for destination management. It chooses the concept of value to explore volunteering experience in an international religious mega‐event, using Holbrook's value typology (efficiency, social value, play, spirituality).Design/methodology/approachThe authors undertake this objective by means of testing psychometric properties of the four value scales, as well as providing a causal model of relationships among value dimensions and overall perceived value, satisfaction and loyalty or commitment to volunteering in a special event tested w…
Emerging hierarchical porous silica-based nanomaterials as sorbents for the analytical determination of organic hazardous compounds
2022
Actualment, l'exposició humana a compostos orgànics perillosos s'ha convertit en una preocupació molt important. La presència de contaminants orgànics al medi ambient ha provocat l'aparició de noves normatives per tal de restringir o prohibir aquestes substàncies perilloses, i el desenvolupament de noves metodologies analítiques per a la seua determinació ha esdevingut un gran repte per a la química analítica actual. A més a més, a part del desenvolupament de noves tècniques instrumentals, l'anàlisi de matrius complexes requereix d’un pas de preconcentració i neteja, per al qual s’han proposat diversos materials nous com a alternatives als adsorbents clàssics. Entre ells, la sílice mesoporo…
Contingent reward leader behaviour: Where does it come from?
2010
As many academics have pointed out, while researchers have learned a great deal about the effects of contingent reward (CR) leader behaviour, relatively little is known about its genesis. CR transactional leadership is traditionally viewed as an independent variable which exerts influence downstream. However, if we are to understand how to influence, improve or modify these downstream effects, we need to shift our focus upstream towards the study of transactional leadership as a dependent variable. In line with this reasoning, we put forward the hypothesis that a contextual variable (organizational learning capability) and a subordinate's characteristic (employability) are antecedents of CR…