Abstract
Journals’ impact indicators are not comparable among scientific fields because of systematic differences in publication and citation habits. In this work, the impact factor was decomposed into five independent variables, as applied to journal category, fields, and areas considered in the databases of the leading provider of science indicators, Thomson Reuters . A Principal Component Analysis was employed to find the sources of the variance and a Cluster Analysis was used to detect similarities. In spite of systematic differences between disciplines, the principal components explain 78% of the total variance. From the statistical point of view, some categories of Science are closer to the Social Sciences than to Science and vice versa.
Highlights
Hábitos de publicación y citación según campos científicos: Principales diferencias a partir de las revistas Journal Citation Reports (JCR)
Habits of publication and citation by scientific field: Main differences based on JCR journals Abstract: Journals’ impact indicators are not comparable among scientific fields because of systematic differences in publication and citation habits
The impact factor was decomposed into five independent variables, as applied to journal category, fields, and areas considered in the databases of the leading provider of science indicators, Thomson Reuters
Summary
El Factor de Impacto (FI) publicado en el Journal Citation Reports (JCR) por Thomson Reuters se define como el número de las referencias promedio que recibe una revista en el año actual a los ‘ítems citables’ publicados en esa revista durante los dos años previos. Se presenta una descomposición del factor de impacto en estas cinco fuentes principales de varianza y se calculan para todas las categorías JCR, campos y áreas científicas considerados en las bases de datos de Thomson Reuters. La segunda de las conclusiones tiene que ver con la necesidad de desarrollar nuevos indicadores normalizados que controlen las fuentes principales de varianza y sean capaces de producir medias similares entre grupos de revistas de campos diferentes.
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