1,721,015 research outputs found
How "real" is mobility from temporary to permanent employment in Italy? A focus on measurement error
No full textThe aim of this paper is to study the effect of measurement error on mobility between different employment types in Italy. For this purpose, we apply a hidden Markov model with two independent indicators for the employment category (permanent contract, temporary contract, self-employed, not employed). The model takes into account that both sources may not be error-free as well as that measurement error may be correlated over time. The two indicators come from ISTAT administrative data and the Labour Force Survey from 2017 to 2021, linked at the individual level. The results show that neither source can be considered error-free and that measurement error severely biases mobility between employment states
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Mesure de l’emploi temporaire. Les données d’enquête ou de registre disent-elles la vérité ?
Full text linkL’une des principales variables de l’Enquête sur la population active des Pays-Bas est celle indiquant si un enquêté possède un emploi permanent ou temporaire. Le but de notre étude est de déterminer l’erreur de mesure de cette variable en appariant l’information tirée de la partie longitudinale de cette enquête à des données de registre uniques provenant de l’organisme de gestion des assurances sociales pour salariés des Pays-Bas (UVW). Contrairement aux approches antérieures visant à comparer des ensembles de données de ce genre, nous tenons compte du fait que les données de registre contiennent aussi des erreurs et que l’erreur de mesure qu’elles présentent est vraisemblablement corrélée dans le temps. Plus précisément, nous proposons d’estimer l’erreur de mesure dans ces deux sources en utilisant un modèle de Markov caché étendu au moyen de deux indicateurs observés du type de contrat d’emploi. Selon nos résultats, aucune des deux sources ne doit être considérée comme étant exempte d’erreur. Pour les deux indicateurs, nous constatons que les travailleurs titulaires d’un contrat d’emploi temporaire sont souvent classés incorrectement comme ayant un contrat d’emploi permanent. En particulier, dans le cas des données de registre, nous observons que les erreurs de mesure sont fortement autocorrélées, car les erreurs commises à une période ont tendance à se répéter. En revanche, lorsque l’enregistrement est correct, la probabilité qu’une erreur soit commise à la période suivante est presque nulle. Enfin, nous constatons que les contrats d’emploi temporaire sont plus répandus que ne le laisse supposer l’Enquête sur la population active, tandis que les taux de transition entre les contrats d’emploi temporaire et permanent sont nettement moins élevés que ne le suggèrent les deux ensembles de données
Short-time work: a bridge to employment security or a springboard to unemployment?
Full text linkThis paper investigates the employment effect of short-time work in the Netherlands during the Great Recession (2009-2011). Short-time work was introduced during the recession under a special arrangement with the aim of reducing unemployment hikes by offering firms the possibility of adjusting the working time of specialised workers rather than adjust the size of their workforce. In this paper, we focus on the effect of short-time work at the individual level of the worker and study whether short-time programme participants in surviving firms had a lower job turnover rate and transition rate to unemployment compared to workers who did not participate in the programme. Furthermore, we study whether flexibility policies of the substantial influence the effectiveness of short-time work in that it protects workers from unemployment. Specifically, we investigate whether the effect of short-time work is related to the intensiveness of its use by the firm and the extensiveness of the use of external flexibility arrangements– i.e., temporary contracts and temporary agency workers – by the firm. For this purpose, we apply a discrete-time survival model using a unique dataset with monthly register data from Statistics Netherlands. Participants in the short-time work programme are compared with non-participant workers from firms that used short-time work and workers from firms that did not make use of the programme. Our findings indicate that, in surviving firms, short-time work had a positive effect: the risk of unemployment and job separation is, in most cases, lower for short-time work participants than non-participants. Short-time work is most effective in protecting workers from unemployment in firms that extended the use of the programme to many workers and for a relatively small number of hours, and that make either moderate use of temporary agency workers or extensive use of fixed-term contracts
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