8 resultados para Difference-in-differences

em Universidad del Rosario, Colombia


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What are the effects of natural disasters on electoral results? Some authors claim that catastrophes have a negative effect on the survival of leaders in a democracy because voters have a propensity to punish politicians for not preventing or poorly handling a crisis. In contrast, this paper finds that these events might be beneficial for leaders. Disasters are linked to leader survival through clientelism: they generate an in-flow of resources in the form of aid, which increase money for buying votes. Analyzing the rainy season of 2010-2011 in Colombia, considered its worst disaster in history, I use a difference-in-differences strategy to show that in the local election incumbent parties benefited from the disaster. The result is robust to different specifications and alternative explanations. Moreover, places receiving more aid and those with judicial evidence of vote-buying irregularities, are more likely to reelect the incumbent, supporting the mechanism proposed by this paper.

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Transfers to women may affect their bargaining power within the household and consequently their well-being. We analyze the effects of the 2004/2005 pension reform in Argentina, that resulted in an unexpected and substantial increase in permanent income for around 1.8 million women, on outcomes arguably related to women’s bargaining power within the household. We estimate the effects of the reform in the probability of divorce/separation, the distribution of household chores, and the probability of women being the head of the household, using a Difference-in-Differences approach. Our results show that despite the low divorce probability among seniors, transfers to senior women have substantial effects on their situation in the household. More specifically, we find that the reform had statistically significant effects on the probability of divorce/separation increasing it by 1.8 − 2.7 percentage points implying an increase of around 18 − 19% on the divorce/separation rate of 60 − 65 year old women. Moreover, the probability of being the head of the household also increased by 2.8−3.3 percentage points representing an increase of 7−19% in the probability amongst women of 60 − 65 years of age. In the case of married women, the probability of being the head of the household increased by 1.3 − 1.5 percentage points, which represents an increase of 20 − 22%. Results show that the distribution of household chores within the couples was also affected by the reform. More precisely, the probability that the wife is the only person in charge of the housework decreased by 5 percentage points, an 11% decrease. The participation of husbands in housework, however, did not change significantly.

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This paper presents evidence of the effect of the recent phases of the business cycle in Spain and United States, proxied by their respective unemployment rates, on the labor market of Colombian cities with high migration tradition. These countries are the main destination for labor Colombian migrants. Using information from the household survey between 2006 and 2011 for urban areas in Colombia and a differences-in-differences approach we find that unemployment rates of those countries negatively affect the probability and the amount of remittances received by Colombian households living in areas with high and moderate migration tradition. At a second stage we provide evidence that unemployment rates of those countries positively affect the labor force participation decisions in Colombian regions with the highest migration tradition.

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This paper estimates the impact of a massive negative income shock led by the simultaneous crash down of several Ponzi schemes (also known as financial ``pyramids"") in Colombia on crime rates at the municipal level. Using novel data on the spatial incidence of the latest wave of Colombian pyramids and their crash down date, I estimate difference-in-differences models with both monthly and yearly frequency. I find that the negative income shock of the pyramids" crash down differentially exacerbates crime in affected municipalities compared to those with no presence of Ponzi schemes. This is true for minor offenses like commercial theft or residential burglary, but not for major crimes as murder or terrorism.

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Este artículo evalúa uno de los componentes fundamentales de la política más icónica del gobierno de Álvaro Uribe: la ´ Seguridad Democrática. En particular, se evalúa el impacto sobre la intensidad del conflicto armado de los despliegues y refuerzos de policía en municipios con poca o nula presencia policial antes de agosto de 2002. Para ello se utiliza el estimador de diferencia en diferencias que compara el cambio en la dinámica del conflicto una vez se asignan los nuevos efectivos a los municipios receptores, relativo al cambio ocurrido simultáneamente en los municipios no receptores. Nuestros resultados sugieren que tanto los despliegues (instauración de inspecciones de policía en municipios que carecían de ´estas) como los refuerzos (envío de nuevos efectivos a municipios con poca presencia policial previa) generan incrementos en el número de ataques guerrilleros. Por otro lado, también hay evidencia que en los casos en los que la asignación de efectivos policiales estuvo acompañada de la movilización de tropas del ejército el conflicto disminuyó en las áreas afectadas, lo que sugiere que la coordinación de las fuerzas armadas resulta clave para el éxito de iniciativas regionales de seguridad.

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Esta investigación analiza el impacto del Programa de Alimentación Escolar en el trabajo infantil en Colombia a través de varias técnicas de evaluación de impacto que incluyen emparejamiento simple, emparejamiento genético y emparejamiento con reducción de sesgo. En particular, se encuentra que este programa disminuye la probabilidad de que los escolares trabajen alrededor de un 4%. Además, se explora que el trabajo infantil se reduce gracias a que el programa aumenta la seguridad alimentaria, lo que consecuentemente cambia las decisiones de los hogares y anula la carga laboral en los infantes. Son numerosos los avances en primera infancia llevados a cabo por el Estado, sin embargo, estos resultados sirven de base para construir un marco conceptual en el que se deben rescatar y promover las políticas públicas alimentarias en toda la edad escolar.

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The perceptive accuracy of university students was compared between men and women, from sciences and humanities courses, to recognize emotional facial expressions. emotional expressions have had increased interest in several areas involved with human interaction, reflecting the importance of perceptive skills in human expression of emotions for the effectiveness of communication. Two tests were taken: one was a quick exposure (0.5 s) of 12 faces with an emotional expression, followed by a neutral face. subjects had to tell if happiness, sadness, anger, fear, disgust or surprise was flashed, and each emotion was shown twice, at random. on the second test 15 faces with the combination of two emotional expressions were shown without a time limit, and the subject had to name one of the emotions of the previous list. in this study, women perceived sad expressions better while men realized more happy faces. there was no significant difference in other emotions detection like anger, fear, surprise, disgust. Students of humanities and sciences areas of both sexes, when compared, had similar capacities to perceive emotional expressions

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The purpose of this investigation was to evaluate if the intervallic exercise near to the maximum of intensity in a similar fitness population and in women is more effective to improve aerobic capacity than the continuous one of smaller intensity. In order to do it, ten healthy women between 18 and 25 years habitual inhabitants of Bogotá city (located at 2600masl) were selected. They signed the informed consent and were divided randomly in two groups of five participants. They were undergoing to two traditional types of training of ten weeks, three times per week, one hour of duration every day. The continuous training group (Group 1) had a VO2peak intensity of 60%; for his part, the intervallic training group (Group 2) had five sessions of ten minutes of exercise at 70% of VO2peak and 90 seconds of recovery between each session. It was possible to demonstrate that, although the Cardiac Frequency (CF) average of group 2 participants during the exercise sessions were always over those of group 1, this difference was not statistically significant. In the same way, the basal CF and the recovery CF, as well as the VO2peak, did not have significant differences between both groups. The systolic and diastolic blood pressure average, as well as the Respiratory Frequency (FR) were always superior in group 2, and these differences were really significant. It was possible to conclude that there is not a significant difference in cardiovascular fitness between sedentary young women, after 10 weeks of two traditional types of aerobic training, one 60% continuous and other one 70% intervalic.