Search results for "Regression Analysis"
showing 10 items of 807 documents
Internal Test Sets Studies in a Group of Antimalarials
2006
Topological indices have been applied to build QSAR models for a set of 20 an- timalarial cyclic peroxy cetals. In order to evalua te the reliability of the proposed linear models leave-n-out and Internal Test Sets (ITS) approaches have b een considered. The pro- posed procedure resulted in a robust and consensued prediction equation and here it is shown why it is superior to the employed standard c ross-validation algorithms involving multilinear regression models.
Automated Procedures Based on Market Comparison Approach in Italy
2017
The question about objective valuation is linked on the one hand to the identification of a large number of reliable sale data, on the other hand to the ability to control the critical evaluation protocol. Automating the valuation process, ensured by computerization of real estate data properly detected, provides a concrete answer to the problem of objectivity, allowing a significant control of the subjective component which characterizes the more traditional appraisals. Automatic methods traditionally proposed at international level are often set on multiple regression models, designed to build prediction functions that are valid throughout the study area, calibrating the coefficients on t…
Linear Regression Analysis
2010
SUMMARY Background: Regression analysis is an important statistical method for the analysis of medical data. It enables the identification and characterization of relationships among multiple factors. It also enables the identification of prognostically relevant risk factors and the calculation of risk scores for individual prognostication. Methods: This article is based on selected textbooks of statistics, a selective review of the literature, and our own experience. Results: After a brief introduction of the uni- and multivariable regression models, illustrative examples are given to explain what the important considerations are before a regression analysis is performed, and how the resul…
Organizational Cooperation and Knowledge Management in Research and Development Organizations
2017
Organizational Cooperation (OC) is a current concept that responds to the growing interdependence among individuals and teams. Likewise, Knowledge Management (KM) accompanies specialization in all sectors of human activity. Most KM processes are cooperation-intensive, and the way both constructs relate to each other is relevant in understanding organizations and promoting performance. The present paper focuses on that relationship. The Organizational Cooperation Questionnaire (ORCOQ) and the Short form of the Knowledge Management Questionnaire (KMQ-SF) were applied to 639 members of research and development (R&D) organizations (Universities and Research Institutes). Descriptive, correla…
An integrated analysis of land market in an inland area of Sicily
2013
In this study a land market analysis of the 22,000 hectares covered by Corleone town area for the 2007-2012 period was carried out. Data on 372 sales agreements concerning agricultural and building land were directly collected from notaries' offices. Over 50% of land sales concerned land areas below 0.50 hectares, whereas just 1% of the overall land sold was larger than 10 hectares. Nearly 75% of sample observations were represented by land sales smaller than 1 hectare. The average land area per purchase was just over 1 hectare. The overall money exchanged in the whole period amounted to nearly 6 million euro, with an average price per sale equal to 16,339.45 (sic), and an average unitary p…
Prevalencia e influencia de la violencia homofóbica sobre la sintomatología depresiva y el nivel de autoestima
2020
Las personas homosexuales y bisexuales constituyen un colectivo sobre el que se ejerce violencia. Este estudio analiza la prevalencia e influencia que ejerce la violencia homofóbica sufrida a lo largo de la vida sobre la sintomatología depresiva y el nivel de autoestima. La muestra está compuesta por 730 personas homosexuales o bisexuales con edades comprendidas entre los 18 y los 60 años (M = 28.47; DT = 8.81). Los resultados indican que entre el 29.6% y 76.7% ha recibido violencia psicológica o verbal y entre el 4.2% y el 19.6% ha sufrido violencia física a lo largo de su vida. También se obtienen diferencias significativas según el género, siendo los hombres quienes refieren mayores tasa…
The role of informal learning in adults' literacy proficiency
2021
This study used the Programme for International Assessment of Adult Competencies (PIAAC) dataset to examine informal literacy learning’s effects on adults’ literacy proficiency. Also, the factors associated with informal literacy learning at and outside of work were studied. The study participants were Nordic adults aged 35–65 years. The statistical method was regression analysis, and the results indicate that informal literacy activities at work are associated primarily with occupation, and informal literacy activities outside of work with education, parents’ education and gender. Initial education, occupation, language background and age exerted the strongest estimated associations with r…
Consistency and word-frequency effects on spelling among first- to fifth-grade French children : A regression-based study.
2008
We describe a large-scale regression study that examines the influence of lexical (word frequency, lexical neighborhood) and sublexical (feedforward and feedback consistency) variables on spelling accuracy among first, second, and third- to fifth-graders. The wordset analyzed contained 3430 French words. Predictors in the stepwise regression analyses were grade-level-based and compiled from child-directed written materials. In all grades, feedforward consistency and word frequency had independent effects. However, whereas the feedforward-consistency contribution remained high and did not vary across grades, the impact of word frequency exhibited a massive jump between first and second grade…
The development of narrative productivity, syntactic complexity, referential cohesion and event content in four- to eight-year-old Finnish children
2013
This study focuses on the development of narrative structure and the relationship between narrative productivity and event content. A total of 172 Finnish children aged between four and eight participated. Their picture-elicited narrations were analysed for productivity, syntactic complexity, referential cohesion and event content. Each measure showed a developmental trend. Concerning consecutive age groups, significant differences were observed between four- and five-year-olds in productivity and event content and between five- and six-year-olds in referential cohesion. Multiple regression analysis showed that the relationship between productivity and event content was important, and espe…
El uso de tú y usted en el área metropolitana de Valencia. Un enfoque variacionista
2017
espanolEn este trabajo se realiza un estudio estadistico sobre el uso de las formas de tratamiento en Valencia y su area metropolitana. Tras una breve introduccion teorica sobre el tema y la explicacion de la metodologia utilizada, ofrecemos los resultados en terminos porcentuales. Pero, al tratarse de un fenomeno en el que intervienen multiples factores al mismo tiempo, hemos realizado tambien un analisis de regresion, que permite ver los resultados cuando todos los factores actuan de manera simultanea. Todas las variables que hemos analizado, salvo la lengua habitual (castellano o valenciano), resultan estadisticamente significativas, si bien las probabilidades de aparicion del tuteo son …