Públicas (UFAL), além disso agradecemos ao CNPQ e a FACEPE pelo apoio financeiro.
ResumoQuais são as vantagens da triangulação metodológica? Apesar de ser consensual a importância da combinação de técnicas quantitativas e qualitativas, ainda são raros os trabalhos que efetivamente utilizam uma abordagem multimétodo. Este artigo apresenta uma introdução aos métodos mistos. Nosso público alvo são estudantes de graduação e pós-graduação em estágios iniciais de treinamento. Metodologicamente, sintetizamos as principais recomendações da literatura e utilizamos dois exemplos para ilustrar como a combinação de técnicas pode ser empregada em desenhos de pesquisa empíricos. Com este artigo, esperamos difundir a utilização de métodos mistos nas Ciências Sociais brasileiras 1 . Palavras-chaves: Métodos Mistos. Triangulação Metodológica. Ciência Política.
The article provides a non-technical introduction to the p value statistics. Its main purpose is to help researchers make sense of the appropriate role of the p value statistics in empirical political science research. On methodological grounds, we use replication, simulations and observational data to show when statistical significance is not significant. We argue that: (1) scholars must always graphically analyze their data before interpreting the p value; (2) it is pointless to estimate the p value for non-random samples; (3) the p value is highly affected by the sample size, and (4) it is pointless to estimate the p value when dealing with data on population.
Introduction: What if my response variable is binary categorical? This paper provides an intuitive introduction to logistic regression, the most appropriate statistical technique to deal with dichotomous dependent variables. Materials and Methods: we estimate the effect of corruption scandals on the chance of reelection of candidates running for the Brazilian Chamber of Deputies using data from Castro and Nunes (2014). Specifically, we show the computational implementation in R and we explain the substantive interpretation of the results. Results: we share replication materials which quickly enables students and professionals to use the procedures presented here for their studying and research activities. Discussion: we hope to facilitate the use of logistic regression and to spread replication as a data analysis teaching tool.
O principal objetivo desse trabalho é aprofundar a discussão a respeito do conceito de correlação de Pearson. Para tanto, apresentamos as suas propriedades, aplicações e limites. Metodologicamente, utilizamos simulação básica para demonstrar como a presença de outliers pode tanto ocultar correlações reais quanto forjar associações inexistentes. Além disso, discutimos os perigos analíticos das correlações espúrias. Com esse artigo esperamos facilitar não só a interpretação, mas também a utilização da técnica de correlação na Ciência Política
Which substantive meaning we can draw from the R2 statistic? The coefficient of determination is defined as the sum of squares due to the regression divided by the sum of total squares. Usually, R2 is interpreted as representing the percentage of variation in the dependent variable explained by variation in the independent variables. This definition is found by both econometrics and statistics handbooks and is widely accepted among quantitative scholars. However, this view is challenged by one of the most distinguished political science methodologists. Gary King argues that the R2 is highly misused as a measure of the influence of X on Y. This paper analyzes the R2 statistic using a non-technical approach. Our purpose is to provide an intuitive understanding of the coefficient of determination and its major shortcomings.
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