Search results for "Statistic"
showing 10 items of 12520 documents
<em>Grid</em> poblacional 2011 para España. Evaluación metodológica de diversas posibilidades de elaboración
2017
Este trabajo presenta una evaluación, desde el punto de vista del usuario, de la malla regular (grid) de población, con resolución de 1 km2 , que el Instituto Nacional de Estadística (INE) ha hecho pública a partir de los resultados del Censo de Población y Viviendas 2011. Esta forma de difusión de resultados resulta muy novedosa y ofrece un gran valor analítico. Por primera vez esta información sobre la distribución espacial de la población se ha generado desde abajo (bottom-up) para el conjunto de España, es decir, a partir del conocimiento de las coordenadas de cada hogar, considerando como tales las del edificio donde reside. La disponibilidad de otra grid con idéntica resolución, elabo…
Establishing Equivalence or Non-Inferiority in Clinical Trials
2012
Background: An increasing number of clinical trials are being performed to show the absence of relevant differences between the effects of two treatments. The primary care physician makes use of the results of so-called equivalence studies, at least indirectly, practically every day. Equally important are active control clinical trials in which the efficacy of a new treatment has to be proven through demonstrating non-inferiority as compared to a standard treatment. Methods: Explanation of basic principles and statistical techniques with reference to the original literature; selective searches in the medical literature. Results: First of all, a suitable distributional parameter must be chos…
Dimensional Latent Structure of Relationship Quality: Results of Three Representative Population Samples
2015
One central issue for every latent construct in psychology (e.g., relationship quality) is its latent nature: Differences in intelligence, for example, are traditionally considered to be dimensional (e.g., when quantifying intelligence by a standardized test score) rather than categorical (distinguishing different categories such as intelligent vs. unintelligent). When considering a categorical construct, such as Down syndrome, on the other hand, the characteristic is qualitative (groups are classified by existence or absence of an extra chromosome) rather than quantitative (varying degrees of Down syndrome). The group bound together by the possession of a certain characteristic (disease, d…
Population size estimation of larval coregonids in large lakes: Stratified sampling design with a simple prediction model for vertical distribution
2009
Abstract The lake-specific vertical distribution of larval coregonids was assessed annually in Finnish lakes by bongo net sampling. The effect of inter-annual and inter-lake variation in vertical distributions on population estimates of larval coregonids were analysed in 1999–2008. The vertical distribution of newly hatched vendace ( Coregonus albula (L.)) and European whitefish ( Coregonus lavaretus L. s.l.) larvae was analysed and high inter-annual and lake-specific variation in the larval vertical distribution was found. Generally, in both littoral and pelagic areas, larvae were aggregated near the water surface, mostly in the top 30 cm layer. We compared observed and predicted density e…
Factorial Structure and Psychometric Properties of the Sensation Seeking Scale – Form V (SSS-V) in a Sample of Italian Adolescents
2013
The present study was designed to evaluate the psychometric properties of the Sensation Seeking Scale – Form V (SSS-V) for the Italian-speaking population. The instrument was administered to 1,530 high school and college students. A second group of 268 high school students completed the SSS-V and the Impulsiveness Questionnaire (IVE). Exploratory factor analysis highlighted a 2-factor structure, Thrill and Adventure Seeking (TAS) and Disinhibition (Dis). Confirmatory factor analysis revealed an adequate model fit. Internal consistency of the subscales was marginally supported using the alpha reliability measure. Convergent validity was supported by significant positive correlations between …
Arithmetic disabilities with and without reading difficulties: A comparison of arithmetic errors
1995
Arithmetic errors of 80 children with arithmetic disabilities, representing 3% of a population‐based sample, and of 80 sex‐ and age‐matched control children were systematically analyzed. In Analysis 1, covariance structure modeling (LISREL) was applied to analyze relations between reading, as measured by text reading accuracy and speed, and arithmetic error types. The results demonstrated that reading accuracy and speed were connected to errors in multiplication fact retrieval. In Analysis 2, a classification of children with arithmetic disabilities into subgroups by reading accuracy and speed difficulties revealed that children with dysfluent reading made more fact‐retrieval errors than di…
Rapid neural encoding of the contrast between native and nonnative speech in the alpha band
2021
AbstractMore than half of the world’s population is multilingual, yet it is not known how the human brain encodes the perception of native vs. nonnative speech. To find out, we asked German native speakers to detect the onset of native and nonnative (English and Turkish) vowels in a roving standard stimulation. Using EEG, we show that nonnativeness is robustly registered by an increase in phase coherence in the alpha band (8-12 Hz), beginning as early as ∼100 ms after stimulus onset and lasting more than 200 ms. The alpha band effect is speech-specific, successfully predicts the response speed advantage of nonnative speech, and grants ∼90% decoding accuracy in distinguishing native vs. nonn…
Eine Kurzversion des Brief Symptom Inventory (BSI-25-F) zum Einsatz bei Gefangenen im Langzeitstrafvollzug in Europa
2014
Strafgefangene sind im Vergleich zur Allgemeinbevölkerung deutlich höher psychisch belastet und stärker suizidgefährdet. Die forensisch-psychologische Diagnostik kann jedoch zumeist nicht auf validierte Testverfahren zurückgreifen. Das kann negative Konsequenzen für Interventionen und somit für das Rückfallrisiko von Straftätern haben. Die vorliegende Studie extrahiert aus dem Brief Symptom Inventory 53 (BSI-53), das bei 1001 Langzeitstrafgefangenen (Mindestfreiheitsentzug 5 Jahre) in 11 europäischen Ländern eingesetzt wurde, eine Kurzversion mit 25 Items. Die vier Skalen Einsamkeit/Depressivität, Körperliche Beschwerden, Selbstwert/Minderwertigkeit und Herausforderndes Verhalten/Aggressiv…
Trends in epidemiology: the role of denominator fluctuation in population based estimates
2021
Background Population estimates are of paramount importance for calculating occurrence and association measures although they can be affected by problems of accuracy and completeness. This study has performed a simulation of the impact of Italian population size variability on incidence rates. Methods Data have been obtained by the Italian National Institute of Statistics. For each year expected cases were calculated at increasing fixed rates (up to 1,000/100,000) and were considered constant in the “following year”, calculating statistical differences (P Results In Italy and in other regions, statistically significant higher RRs were found in 2012 vs. 2011 whereas statistically significant…
Does taking additional Maths classes in high school affect academic outcomes?
2023
Several studies in the mathematical education literature show the effect of students’ high school skills in maths on their success at higher levels of education and work. In particular, the importance of maths course taking in US high schools is highlighted to be important for college enrolment and completion. The choice of taking additional maths courses or, as in Italy, of choosing a high-school curriculum with more maths, is not random: it depends on several substantial factors such as gender and socio-economic status. This selection bias implies that the differences in the academic outcomes might be traceable not only to mathematics ability and knowledge. In this paper, the aim is to es…