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Appointments

These indicators are in favor conditional of political and social factors. They measure the scientific productivity, that is the amount of publications produced by an author, country or institution during a period of certain time. The average production approximately stays constant around 2 publications by author. Also they measure the production index, that is the amount of authors responsible for 50% of the published works. This serves to classify to the authors in three levels according to its production. Also they measure the transitoriness index, that is the amount of authors responsible for a single work. Indicators of circulation They measure the presence of documents in the libraries and bibliographical data bases. They are in favor conditional of the specialization and the language of publications.

These indicators are used to see the distribution of the magazines and its cover in the data bases. The main indicators are: Number of circulating works: amount of works indizados in the data bases. Index of circulation: quotient of the number of circulating works and the totality of the works published by a magazine in a period of time. Index of circulating productivity: logarithm of the number of circulating works. Indicators of dispersion It is important to study the dispersion of the scientific information due to the great variability of these dispersions, since sometimes, the works are concentrated in a number very reduced of magazines, whereas in others, they disperse in a very high number. Some times the zone of maximum densidad agrees with specialized magazines, but frequently they agree with magazines of general character. Indicators of use of scientific Literature The information consumption is moderate through publication calculation and the analysis of references. The difference between the references and the appointments is that, in first, reference to published previously works is made and the appointments are received from later works.

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