Job durations with worker and firm specific effects: MCMC estimation with longitudinal employer-employee data

We study job durations using a multivariate hazard model allowing for workerspecific and firm-specific unobserved determinants. The latter are captured by unobserved heterogeneity terms or random effects, one at the firm level and another at the worker level. This enables us to decompose the variation in job durations into the relative contribution of the worker and the firm. We also allow the unobserved terms to be correlated. For the empirical analysis we use a Portuguese longitudinal matched employer-employee data set. The model is estimated with a Bayesian Markov Chain Monte Carlo (MCMC) estimation method. The results imply that firm characteristics explain around 30% of the variation in log job durations. In addition, we find a positive correlation between unobserved worker and firm characteristics.Job transitions; assortative matching; Gibbs sampling; frailties; dynamic models; matched employer-employee data

An empirical assessment of assortative matching in the labor market

In labor markets with worker and firm heterogeneity, the matching between firms and workers may be assortative, meaning that the most productive workers and firms team up. We investigate this with longitudinal population-wide matched employer-emplyee data from Portugal. Using dynamic panel data methods, we quantify a firm-specific productivity term for each firm, and we relate this to the skill distribution of workers in the firm. We find that there is positive assortative matching, in particular among long-lived firms. Using skill-specific estimates of an index of search frictions, we find that the results can only to a small extent be explained by heterogeneity of search frictions across worker skill groups.Positive assortative matching; matched employer-employee data; productivity; skill; unobserved heterogeneity; sorting; fixed effects

Job Durations with Worker and Firm Specific Effects: MCMC Estimation with Longitudinal Employer-Employee Data

We study job durations using a multivariate hazard model allowing for worker-specific and firm-specific unobserved determinants. The latter are captured by unobserved heterogeneity terms or random effects, one at the firm level and another at the worker level. This enables us to decompose the variation in job durations into the relative contribution of the worker and the firm. We also allow the unobserved terms to be correlated. For the empirical analysis we use a Portuguese longitudinal matched employer-employee data set. The model is estimated with a Bayesian Markov Chain Monte Carlo (MCMC) estimation method. The results imply that firm characteristics explain around 30% of the variation in log job durations. In addition, we find a positive correlation between unobserved worker and firm characteristics.job transitions, assortative matching, Gibbs sampling, frailties, dynamic models, matched employer-employee data

LexMart: A smart tool for lexicographers

The digital era has brought some challenges to lexicographers, but it has also brought new opportunities as part of the rise of information technology and, more recently, the emergence of digital humanities. This paper provides a description of LeXmart, the framework that supports the digital development of the Portuguese Academy of Sciences Dictionary. LeXmart is a smart tool framework to support lexicographers' work that offers different types of tools, ranging from a structural editor to a set of validation tools. Given that the dictionary is stored in eXist-DB, LeXmart is developed on top of its ecosystem, using W3C standard languages, and offering default functionalities offered by eXist-DB, namely a RESTful API.H2020 - Horizon 2020 Framework Programme (731015

Tangible fixed assets For SME: Portuguese and Spain evidence

The problem statement of this research is the application level of IAS 16 - Property, Plant and Equipment in SMEs provide by SME in Portugal and Spain. Indeed, the purpose of the research is comparing the accounting framework of IAS 16 - Property, Plant and Equipment in SME in Portugal and Spain. Also, it considers the information disclosure, conduct annually by the SME in both countries, comparing their similarities and differences. The methodology a used descriptive, pilot and explanatory analysis with support of a literature review of the normative and legal framework applicable to SME in the two countries. In addition, it understands the accounting changes resulting from legislation compared to previous normative. Indeed, it will be made an exhaustive documentary analysis of the content of the disclosure provided in the Annual Reports made by SME, through the Annex. The findings of the research allow to analyze the disclosure made by the SME and the applicable framework and the detail information about the IAS 16 - Property, Plant and Equipment. The main conclusion is centred on the Tangible Fixed Assets represent the largest percentage of assets in SME as collateral of financial decisions. Therefore, it allows stakeholders to take strategic decisions, including new investments

Attachment orientations and family functioning: The mediating role of emotion regulation.

Attachment insecurity has been found to be associated with poor family functioning. The mechanisms underlying this link, however, are less explored. This study examines the potential mediating role of emotion regulation in the association between attachment orientations and family functioning. Self-report scales measuring attachment, family functioning, and emotion regulation were administered to 132 adults (58% women; 57.63 years). Results showed that both attachment anxiety and attachment avoidance were associated with poor family functioning. Furthermore, emotion suppression, but not positive reappraisal, was found to partially mediate the association between attachment insecurity (both anxiety and avoidance) and perceived family functioning. Findings suggest that emotion regulation seems to play a role in the impact that attachment orientations may have on family functioning.Fundação para a Ciência e Tecnologia - FCTinfo:eu-repo/semantics/publishedVersio

Computable randomness is about more than probabilities

We introduce a notion of computable randomness for infinite sequences that generalises the classical version in two important ways. First, our definition of computable randomness is associated with imprecise probability models, in the sense that we consider lower expectations (or sets of probabilities) instead of classical 'precise' probabilities. Secondly, instead of binary sequences, we consider sequences whose elements take values in some finite sample space. Interestingly, we find that every sequence is computably random with respect to at least one lower expectation, and that lower expectations that are more informative have fewer computably random sequences. This leads to the intriguing question whether every sequence is computably random with respect to a unique most informative lower expectation. We study this question in some detail and provide a partial answer

Depression and sleep quality in older adults: a meta-analysis.

The literature emphasizes depression and poor sleep quality as problems that affect many elderly individuals. However, these problems have been related in few studies and there is no meta-analysis performed so far on this relationship. The present research reviewed the studies performed on the subjective sleep quality in order to understand how it relates to depression in older adults. The review was conducted in January 2016 and comprised publications between 2005 and 2015. Based on the electronic databases Web of Science and EBSCO, we used the keywords 'sleep quality', 'depression', and 'older' to identify the empirical studies performed. After assessing the collected studies, we selected those that presented the elderly as participants, resulting in nine papers (N=3069). A random-effects method was used to evaluate the relationship between depression and sleep. We found that an older person's lack of good sleep quality is significantly related with depression. The main limitation of this study was the difficulty in collecting a greater number of studies. Future research should consider the importance of additional variables (e.g. moderators) in order to understand and investigate viable interventions for prevention and health promotion in the elderly

Practitioner learning curve in fitting scleral lenses in irregular and regular corneas using a fitting trial

Purpose. To assess the learning curve of a novel practitioner with minor previous experience with scleral lenses (SL) fitting in the initial 156 consecutive fittings in irregular and regular corneas using a fitting trial. Methods. Prospective dispensing case series involving a total of 85 subjects (156 eyes), 122 eyes with irregular corneas (IC Group) and 34 eyes with regular corneas (RC Group). All lenses were fitted by the same practitioner with minimal previous knowledge and practice on SL fitting. The first 156 consecutive fits were studied to estimate the number of trial lenses required to achieve the optimal fit and the number of reorders required. The results were divided into 8 chronological groups of 20 fittings (eyes) each. Results. There was a decrease in the number of trial lenses required to achieve the optimal fit from 2.35 +/- 0.18 lenses in the first 20 fittings to 1.56 +/- 0.13 in the last fittings (p<0.05, Wilcoxon). There were no statistically significant differences between IC and RC groups. Regarding the number of reorders, there was also a decrease from 0.95 +/- 0.17 in the first fittings to 0.25 +/- 0.11 in the last fittings (p<0.05, Wilcoxon). Thought not statistically significant, there was an increase in the use of toric designs with increasing experience. Conclusions. Practitioner fitting experience reduced both the number of trial lenses required to achieve the best fit and the number of reorders with time. After the first 60 cases, there was a significant reduction in the trial lenses and reorders necessity.Bausch and Lomb (PTDC/SAU-BEB/098392/2008

A Systematic Review and Meta-Analysis of Direct Comparisons

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