Evaluating the Power of Latent Growth Curve Models to Detect Individual Differences in Change     

Christopher Hertzog  Timo von Oertzen  Paolo Ghisletta  Ulman Lindenberger 《Structural equation modeling》2013,20(4):541-563

We evaluated the statistical power of single-indicator latent growth curve models to detect individual differences in change (variances of latent slopes) as a function of sample size, number of longitudinal measurement occasions, and growth curve reliability. We recommend the 2 degree-of-freedom generalized test assessing loss of fit when both slope-related random effects, the slope variance and intercept-slope covariance, are fixed to 0. Statistical power to detect individual differences in change is low to moderate unless the residual error variance is low, sample size is large, and there are more than four measurement occasions. The generalized test has greater power than a specific test isolating the hypothesis of zero slope variance, except when the true slope variance is close to 0, and has uniformly superior power to a Wald test based on the estimated slope variance.  相似文献   

A strange horn between Paolo Mantegazza and Charles Darwin     

Carla Garbarino  Paolo Mazzarello 《Endeavour》2013

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Ginzburg in Harlem: History,Structure and the Politics of Primitivism     

Paolo Palladino 《Culture, Theory & Critique》2013,54(2):203-217

Abstract

The historian Carlo Ginzburg is renowned for his critique of modern, scientific reason and his articulation of an alternative form of knowledge which he labels ‘conjectural’. This form of knowledge, supposedly more attuned to the historian’s interest in the singular and specific fragment, as opposed to the abstract and universal concept, is so rooted in the practices of the prehistoric hunter that Ginzburg sometimes describes it as a ‘venatic’ form of deduction, binding ‘the human animal closely to other animal species’. In this essay, I explore the ramifications of this alternative form of knowledge, attending especially to its relationship to the modernist theme of ‘primitivism’. I do so by juxtaposing Ginzburg’s critical appraisal of Arthur Conan Doyle’s most famous literary invention, Sherlock Holmes, and Rudolph Fisher’s own literary invention, John Archer, the physician who sometimes aids criminal investigations in African American Harlem. I argue that the differences between Archer and Holmes draw attention to some troubling implications of Ginzburg’s historiographical argument. Folding this analysis on itself, however, I also suggest that what might be at stake, when Ginzburg insists so troublingly on the importance of the singular, venatic trace, is the evocation of Walter Benjamin’s understanding of the historical ‘event’.  相似文献   

Using the Web as corpus for self-training text categorization     

Rafael Guzmán-Cabrera  Manuel Montes-y-Gómez  Paolo Rosso  Luis Villaseñor-Pineda 《Information Retrieval》2009,12(3):400-415

Most current methods for automatic text categorization are based on supervised learning techniques and, therefore, they face the problem of requiring a great number of training instances to construct an accurate classifier. In order to tackle this problem, this paper proposes a new semi-supervised method for text categorization, which considers the automatic extraction of unlabeled examples from the Web and the application of an enriched self-training approach for the construction of the classifier. This method, even though language independent, is more pertinent for scenarios where large sets of labeled resources do not exist. That, for instance, could be the case of several application domains in different non-English languages such as Spanish. The experimental evaluation of the method was carried out in three different tasks and in two different languages. The achieved results demonstrate the applicability and usefulness of the proposed method.  相似文献   

Return mobility and scientific productivity of researchers working abroad: The role of home country linkages   总被引：1，自引：0，他引：1  

Stefano H. Baruffaldi  Paolo Landoni 《Research Policy》2012,41(9):1655-1665

Through an analysis of 497 foreign researchers in Italy and Portugal we verify the impact of home linkages on return mobility choices and scientific productivity. We consider the presence of several different types of linkages of the researchers working abroad with their country of origin and control for the most relevant contextual factors (age, research area, position in the host country, etc.). The probability of return to their home country and scientific productivity in the host country are both higher for researchers that maintain home linkages. We conclude that the presence of home linkages directly benefits both countries in addition to the indirect benefit of expanding the scientific networks. Policy implications and suggestions for further research are discussed.  相似文献   

Petrographic and chemical characterisation of fine ware from three Archaic and Hellenistic kilns in Gela,Sicily     

Erica Aquilia  Germana Barone  Paolo Mazzoleni  Caterina Ingoglia 《Journal of Cultural Heritage》2012,13(4):442-447

This work is focused on the petro-archeometric characterization of the fine pottery production of the archaeological site of Gela (Sicily). Thirty-five samples coming from three Archaic and Hellenistic kilns and five coming from an Hellenistic house, were investigated by means of optical microscopy, XRD and XRF analysis. With the exception of some ceramics which are undoubtedly imported, all the samples have similar petrographic features, but on the basis of chemical composition, we can distinguish two different groups. The presence of two local productions is confirmed by the comparison with locally outcropping sediments and with archaic and modern bricks of sure Geloan production. This result is particularly significant for the definition of reference groups of this wealthy polis that played an important trading role in the Mediterranean area.  相似文献   

Spectroscopic analyses of Hellenistic painted plasters from 2nd century B.C., Sicily (South Italy)     

Erica Aquilia  Germana Barone  Vincenza Crupi  Francesca Longo  Domenico Majolino  Paolo Mazzoleni  Valentina Venuti 《Journal of Cultural Heritage》2012,13(2):229-233

In the present work, an analytical characterization of painted plaster samples coming from ancient buildings dated back to 2nd cent. B.C., located in Licata (Sicily, Southern Italy), has been carried out. The investigation has been performed through different spectroscopic techniques: X-ray fluorescence (XRF) using an handheld energy-dispersive XRF analyzer, scanning electron microscopy equipped with an Energy Dispersive Spectrometry microanalysis detector (SEM-EDS) and Fourier transform infrared absorbance spectroscopy (FT-IR). The main goal is to identify the plaster and pigments material. In particular, the XRF investigation of surfaces is the first step for a preliminary elemental characterization. Then, through SEM-EDS measurements, a quantitative analysis of the chemical composition of the plaster and the pigmenting agents along with eventual components related to deterioration processes has been obtained. Finally, FT-IR absorbance spectra have proven to be a useful tool to investigate the molecular nature of the used materials.  相似文献   

Participation,performance and inequality in Italian higher education in the 20th century     

Moris Triventi  Paolo Trivellato 《Higher Education》2009,57(6):681-702

Using data from the five waves of the Italian Longitudinal Household Survey, this paper examines the dynamics of Italian higher education in the twentieth century. The main goals are to study changes in participation in higher education (enrolment, transition, and graduation rates), in performance (drop out and delayed graduation rates, average delay duration), and how these have changed in different social classes. The main results are as follows. Enrolment growth has not been followed by a proportional increase in graduation rates. The drop out rate, the number of delayed graduations and the average delay duration were already high before the 1969 reform, and subsequently increased over time. Delayed graduations increased among students from both upper-middle and lower-middle classes, whereas the drop out rate rose only among the latter, and stayed steady for the former. As a whole, absolute inequalities persisted over time, with any slight reduction that took place resulting from declining performance of the upper classes, and not from an improvement of the lower classes.

Paolo TrivellatoEmail:

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Dysregulated Fear,Social Inhibition,and Respiratory Sinus Arrhythmia: A Replication and Extension          下载免费PDF全文

Kristin A. Buss  Elizabeth L. Davis  Nilam Ram  Michael Coccia 《Child development》2018,89(3):e214-e228

Behavioral inhibition indicates increased risk for development of social anxiety. Recent work has identified a pattern of dysregulated fear (DF), characterized by high fear in low‐threat situations, that provides a more precise marker of developmental risk through early childhood. This study tested a new longitudinal sample of children (n = 124) from ages 24 to 48 months. Replicating prior findings, at 24 months, we identified a pattern of fearful behavior across contexts marked by higher fear to putatively low‐threat situations. DF was associated with higher parental report of social inhibition at 24, 36, and 48 months. Extending prior findings, we observed differences in cardiac physiology during fear‐eliciting situations, suggesting that the neurobiological underpinnings of DF relate to difficulty with regulation.  相似文献   

Weighted Word Pairs for query expansion     

Francesco Colace  Massimo De Santo  Luca Greco  Paolo Napoletano 《Information processing & management》2015

This paper proposes a novel query expansion method to improve accuracy of text retrieval systems. Our method makes use of a minimal relevance feedback to expand the initial query with a structured representation composed of weighted pairs of words. Such a structure is obtained from the relevance feedback through a method for pairs of words selection based on the Probabilistic Topic Model. We compared our method with other baseline query expansion schemes and methods. Evaluations performed on TREC-8 demonstrated the effectiveness of the proposed method with respect to the baseline.  相似文献