A characterization of the scientific impact of Brazilian institutions

TL;DR

This paper introduces a novel method using Tsallis q-exponential distribution to characterize and compare the scientific impact of Brazilian institutions over time, integrating publication quantity and citation quality into a unified metric.

Contribution

It proposes a new performance metric based on nonextensive thermostatistics to evaluate research impact, applicable across institutions and time periods.

Findings

The distribution of citations fits a universal q-exponential curve with q≈4/3.

The effective temperature T serves as a new impact metric.

Research activity in Brazil shows temporal evolution and variation.

Abstract

In this paper we studied the research activity of Brazilian Institutions for all sciences and also their performance in the area of physics between 1945 and December 2008. All the data come from the Web of Science database for this period. The analysis of the experimental data shows that, within a nonextensive thermostatistical formalism, the Tsallis \emph{q}-exponential distribution $N(c)$ can constitute a new characterization of the research impact for Brazilian Institutions. The data examined in the present survey can be fitted successfully by applying a universal curve namely, $N(c) \propto 1/[1+(q-1) c/T]^{\frac{1}{q-1}}$ with $q\simeq 4/3$ for {\it all} the available citations $c$, $T$ being an "effective temperature". The present analysis ultimately suggests that via the "effective temperature" $T$, we can provide a new performance metric for the impact level of the research activity in Brazil, taking into account the number of the publications and their citations. This new performance metric takes into account the "quantity" (number of publications) and the "quality" (number of citations) for different Brazilian Institutions. In addition we analyzed the research performance of Brazil to show how the scientific research activity changes with time, for instance between 1945 to 1985, then during the period 1986-1990, 1991-1995, and so on until the present. Finally, this work intends to show a new methodology that can be used to analyze and compare institutions within a given country.