Is There a Direct Causal Effect of Education on Dementia? A Swedish Natural Experiment on 1.3 Million Individuals

2019 ◽  
Author(s):  
Dominika Seblova ◽  
Martin Fischer ◽  
Stefan Fors ◽  
Kristina Johnell ◽  
Martin Karlsson ◽  
...  
2021 ◽  
pp. 1-7
Author(s):  
Pablo Brugarolas ◽  
Luis Miller

Abstract This letter reports the results of a study that combined a unique natural experiment and a local randomization regression discontinuity approach to estimate the effect of polls on turnout intention. We found that the release of a poll increases turnout intention by 5%. This effect is robust to a number of falsification tests of predetermined covariates, placebo outcomes, and changes in the time window selected to estimate the effect. The letter discusses the advantages of the local randomization approach over the standard continuity-based design to study important cases in political science where the running variable is discrete; a method that may expand the range of empirical topics that can be analyzed using regression discontinuity methods.


2018 ◽  
Vol 115 (42) ◽  
pp. 10624-10629 ◽  
Author(s):  
Laia Balcells ◽  
Gerard Torrats-Espinosa

This study investigates the consequences of terrorist attacks for political behavior by leveraging a natural experiment in Spain. We study eight attacks against civilians, members of the military, and police officers perpetrated between 1989 and 1997 by Euskadi Ta Askatasuna (ETA), a Basque terrorist organization that was active between 1958 and 2011. We use nationally and regionally representative surveys that were being fielded when the attacks occurred to estimate the causal effect of terrorist violence on individuals’ intent to participate in democratic elections as well as on professed support for the incumbent party. We find that both lethal and nonlethal terrorist attacks significantly increase individuals’ intent to participate in a future democratic election. The magnitude of this impact is larger when attacks are directed against civilians than when directed against members of the military or the police. We find no evidence that the attacks change support for the incumbent party. These results suggest that terrorist attacks enhance political engagement of citizens.


2016 ◽  
Vol 14 (4) ◽  
pp. 952-975 ◽  
Author(s):  
Matthew A. Kocher ◽  
Nuno P. Monteiro

Qualitative historical knowledge is essential for validating natural experiments. Specifically, the validity of a natural experiment depends on the historical processes of treatment assignment and administration, including broader macro-historical dynamics. But if validating a natural experiment requires trust in the ability of qualitative evidence to establish the causal processes through which the data were generated, there is no good reason for natural experiments to be considered epistemically superior to historical research. To the contrary, the epistemic status of natural experiments is on a par with that of the historical research on which their validation depends. They are two modes of social-scientific explanation, each with its own pros and cons; neither is privileged. We illustrate this argument by re-examining an important recent contribution to the literature on violent conflict: Ferwerda and Miller’s 2014 natural experiment estimating the causal effect of the German decision to devolve authority to the Vichy French government on violent resistance during World War II.


2010 ◽  
Vol 2 (4) ◽  
pp. 105-127 ◽  
Author(s):  
Maria Guadalupe ◽  
Julie Wulf

This paper establishes a causal effect of product market competition on various characteristics of organizational design. Using a unique panel dataset on firm hierarchies of large US firms (1986–1999) and a quasi-natural experiment (trade liberalization), we find that competition leads firms to flatten their hierarchies: firms reduce the number of positions between the CEO and division managers, and firms increase the number of positions reporting directly to the CEO. The results illustrate how firms redesign their organizational structure through a set of complementary choices in response to changes in their environment. We discuss several possible interpretations of these changes. (JEL D23, F13, G34, M12, M51)


2017 ◽  
Vol 43 (1) ◽  
pp. 27-41 ◽  
Author(s):  
Pornsit Jiraporn ◽  
Pandej Chintrakarn ◽  
Shenghui Tong ◽  
Sirimon Treepongkaruna

Exploiting the passage of the Sarbanes–Oxley Act (SOX) as an exogenous regulatory shock, we investigate whether board independence substitutes for external audit quality. Based on over 14,000 observations across 18 years, our difference-in-difference estimates show that firms forced to raise board independence are far less likely to employ a Big 4 auditor. In particular, board independence lowers the propensity to use a Big 4 auditor by approximately 38%. Firms with stronger board independence enjoy more effective governance and therefore do not need as much external audit quality as those with less effective governance do. Based on a natural experiment, our empirical strategy is far less vulnerable to endogeneity and is thus considerably more likely to show a causal effect, rather than merely an association.


2019 ◽  
Vol 19 (2) ◽  
Author(s):  
Beatrice Schindler Rangvid

Abstract Grading bias against boys may be one of the reasons why boys underperform in school compared to girls. This study assesses the causal effect of blind grading of boys relative to girls using difference-in-differences methods and exploiting two separate identification strategies: a unique full cohort natural experiment providing exogenous variation in blind grading, and a field experiment where the exact same exam papers are scored twice (blind and non-blind). Even though the two strategies hinge on different assumptions, the results persistently suggest against the existence of systematic gender biases in non-blind evaluation. The results are robust to different model specifications.


BMJ Open ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. e043247
Author(s):  
Jan Ole Ludwig ◽  
Neil M Davies ◽  
Jacob Bor ◽  
Jan-Walter De Neve

ObjectivesA growing literature highlights the intergenerational transmission of human capital from parents to children. However, far less is known about ‘upward transmission’ from children to parents. In this study, we use a 1996 Botswana education policy reform as a natural experiment to identify the causal effect of children’s secondary schooling on their parents’ health.SettingBotswana’s decennial census (2001 and 2011). Data were obtained through the Integrated Public Use Microdata Series and are 10% random samples of the complete population in each of these census years.ParticipantsSurvey respondents who were citizens born in Botswana, at least 18 years old at the time of the census and born in or after 1975 (n=89 721).Primary and secondary outcome measuresParental survival and disability at the time of the census, separately for mothers and fathers.ResultsThe 1996 reform caused a large increase in grade 10 enrolment, inducing an additional 0.4 years of schooling for the first cohorts affected (95% CI 0.3 to 0.5, p<0.001). The reform, however, had no effect on parental survival and disability by the time exposed child cohorts reach age 30. Results were robust to a wide array of sensitivity analyses.ConclusionsThis study found little evidence that parents’ survival and disability were affected by their offspring’s educational attainment in Botswana. Parents’ health may not be necessarily affected by increasing their offspring’s educational attainment.


2021 ◽  
Vol 30 ◽  
Author(s):  
Y. Matsuyama ◽  
H. Jürges ◽  
M. Dewey ◽  
S. Listl

Abstract Aims Depression severely affects people's health and well-being. Oral diseases have been suggested to be associated with depression, but so far, there is no causal evidence. This study aimed to identify the causal effect of tooth loss on depression among US adults in a natural experiment study. Methods Instrumental variable analysis was conducted using data from 169 061 respondents born in 1940–1978 who participated in the 2006, 2008 or 2010 waves of the Behavioral Risk Factor Surveillance System (BRFSS). Random variation in tooth loss due to differential childhood exposure to drinking water fluoride was exploited as an instrument. Results US adults who were exposed to drinking water fluoride in childhood had more remaining teeth, therefore providing a robust instrument (F = 73.4). For each additional tooth loss, depressive symptoms according to the eight-item Patient Health Questionnaire depression (PHQ-8) score increased by 0.146 (95% CI 0.008–0.284), and the probability of having clinical depression (PHQ ⩾10) increased by 0.81 percentage points (95% CI −0.12 to 1.73). Conclusions Tooth loss causally increased depression among US adults. Losing ten or more teeth had an impact comparable to adults with major depressive disorder not receiving antidepressant drugs.


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