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New challenges arise in data visualization when the research involves a sizable database. With many data points, classical scatterplots are non-informative due to the cluttering of points. On the contrary, simple plots, such as the boxplot that are of limited use in small samples, offer great potential to facilitate group comparison in the case of an extensive sample. This article presents exploratory data analysis methods useful for inspecting variation across groups in crucial variables and detecting heterogeneity. The exploratory data analysis methods (introduced by Tukey in his seminal book of 1977) encompass a set of statistical tools aimed to extract information from data using simple graphical tools. In this article, some of the exploratory data analysis methods like the boxplot and scatterplot are revisited and enhanced using modern graphical computational devices (as, for example, the heat-map) and their use illustrated with Spanish Social Security data. We explore how earnings vary across several factors like age, gender, type of occupation, and contract, and in particular, the gender gap in salaries is visualized in various dimensions relating to the type of occupation. The exploratory data analysis methods are also applied to assessing and refining competing regressions by plotting residuals-versus-fitted values. The methods discussed should be useful to researchers to assess heterogeneity in data, across-group variation, and classical diagnostic plots of residuals from alternative models fits. JEL CLASSIFICATION: C55; J01; J08; Y10; C80

We extend standard methodology for multigroup mean and covariance structure (MACS) analysis to the case where assessment of across-group variation of model parameters is the focus of the study and the data deviate from standard assumptions. The proposed methods are applied to analyze an accounting profitability database covering more than 100,000 firms in the 15 European Union (EU) countries in the period 1999 to 2003. A multivariate model with permanent and dynamic latent components of profitability is used to assess across-country variation of firm level profitability and persistence. We show that there are substantial differences among these countries, despite the partial integration of their economies. Estimation of supplementary parameters are proposed as a way to characterize persistence in each country, as well as across-group variation of model parameters. This methodology is more widely applicable in international organizational research. ; The authors disclosed receipt of the following financial support for the research and/or authorship of this article: Partially supported by grants SEJ2006–13537 and PR2007–0221 from the Spanish Ministry of Science and Technology and by grants GV05/125 and BEST/2008/038 from the Generalitat Valenciana (Spain).

During the last decade, the Catalonian secessionist challenge induced a chronic crisis within Spain's politics that does not offer hints of a viable arrangement. The rapidly escalating demands for secession ran almost in parallel with the accentuation of the economic recession that followed the disruption of the world financial system in 2008-2010. Such secession claims reached maximums during 2012-2014, attaining support levels of nearly 50% of citizenry in favour of independence. These figures subsequently diminished a bit but remained close to that level until today. Despite the coincident course, previous studies had shown that the impact of economic hardships was not a major factor in explaining the segregation urgencies, connecting them instead to triggers related to internecine political struggles in the region: Harsh litigations that resulted in an abrupt polarization along nationalistic features in wide segments of the population. In this longitudinal analysis based on the responses of 88,538 individuals through a regular series of 45 official surveys, in the period 2006-2019, we show that economic factors did play a role in the secessionist wave. Our findings showed that the main idiomatic segmentation (Catalan vs. Spanish, as family language) interacted with economic segmentations in inducing variations on national identity feelings that resulted in erosions of the dual CatSpanish identity. Moreover, our findings also showed that the more privileged segments of Catalonian citizenry where those that mostly supported secession, whereas poorer and unprotected citizenry was clearly against it. All the data points to the conclusion that the secessionist challenge was, in fact, a rebellion of the wealthier and well-situated people.

Catalonian secessionism acquired prominence from 2010 onwards. During the last decade secessionist parties won three regional elections and sustained Governments by tiny majorities at the Autonomous Parliament. Two illegal consultations about self-determination were called and around 2 million (38% of population census) supported secession from Spain. An "Independence Declaration" was proclaimed on 27th Oct. 2017, followed by suspension of Home Rule sanctioned by Spanish Parliament that endured till mid-2018. The main consequence of the secessionist push was the build-up of a confrontation between two large segments of Catalan citizenry, unionists and secessionists, which was absent before. This study aims to shed light on the rise of secessionism and the appearance of a deep fissure between these communities. By building upon the complete series of data from iterated official polls (88.538 respondents, 45 surveys), the paper displays the evolving changes along the period 2006–2019 of national identity feelings ("sense of belonging"). Along that period, there were increases exceeding 15 percentage points of "only Catalan" national identity and analogous decreases of "equally Catalan and Spanish" dual national identity. The findings disclosed highly significant covariations between changing trends on national identity feelings with: (1) family/mother language, Catalan vs. Spanish; (2) following regional media versus other media. Since language/ascendancy origins and media consumption trends are closely interrelated, within Catalonia, our discussion focuses on the role played by such ethno-cultural cleavage. Further, statistical analysis for longitudinal data identified several turning points linked to singular political events that likely accentuated polarization around the issue of secession. The findings unveil evolving tracks that could help in the understanding of a process that, in a very short time, produced a severe social division within a fully open and democratic society at the heart of Europe. ; Damián Gil M.D. provided the first script that permitted to build the database of the full series of CEO Barometers. OEC Group members provided lively discussions with suggestions that improved and helped to focus the present research. A.T. work was partially supported by AFOSR-MINERVA FA9550-18-0496 Grant and Bial Foundation Grant 163/14. ; Damián Gil M.D. provided the first script that permitted to build the database of the full series of CEO Barometers. OEC Group members provided lively discussions with suggestions that improved and helped to focus the present research. A.T. work was partially supported by AFOSR-MINERVA FA9550-18-0496 Grant and Bial Foundation Grant 163/14.

A.T. work was partially supported by AFOSR-MINERVA FA9550-18-0496 Grant and Bial Foundation Grant 163/14. ; Catalonian secessionism acquired prominence from 2010 onwards. During the last decade secessionist parties won three regional elections and sustained Governments by tiny majorities at the Autonomous Parliament. Two illegal consultations about selfdetermination were called and around 2 million (38% of population census) supported secession from Spain. An "Independence Declaration" was proclaimed on 27th Oct. 2017, followed by suspension of Home Rule sanctioned by Spanish Parliament that endured till mid2018. The main consequence of the secessionist push was the build-up of a confrontation between two large segments of Catalan citizenry, unionists and secessionists, which was absent before. This study aims to shed light on the rise of secessionism and the appearance of a deep fissure between these communities. By building upon the complete series of data from iterated official polls (88.538 respondents, 45 surveys), the paper displays the evolving changes along the period 2006-2019 of national identity feelings ("sense of belonging"). Along that period, there were increases exceeding 15 percentage points of "only Catalan" national identity and analogous decreases of "equally Catalan and Spanish" dual national identity. The findings disclosed highly significant covariations between changing trends on national identity feelings with: (1) family/mother language, Catalan vs. Spanish; (2) following regional media versus other media. Since language/ascendancy origins and media consumption trends are closely interrelated, within Catalonia, our discussion focuses on the role played by such ethno-cultural cleavage. Further, statistical analysis for longitudinal data identified several turning points linked to singular political events that likely accentuated polarization around the issue of secession. The findings unveil evolving tracks that could help in the understanding of a process that, in a very short time, produced a severe social division within a fully open and democratic society at the heart of Europe.