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5. Explain the meaning of an impact-factor, give an example of its calculation.

Impact factor (IF) is a numerical indicator of the importance of a scientific journal. Since the 1960s, it has been calculated annually by the Institute for Scientific Information (ISI), which in 1992 was acquired by Thomson Corporation and is now called Thomson Scientific, and is published in the journal Journal Citation Report. In accordance with IF (mainly in other countries, but more recently in Russia), the level of journals is assessed, the quality of the articles published in them, provide financial support to researchers and take employees to work. Impact factor has, though a great, but ambiguously estimated influence on the evaluation of the results of scientific research.

The calculation of the impact factor is based on a three-year period. For example, the impact factor of the magazine in 2014 I2014 is calculated as follows: I2014 = A / B, where: A - is the number of citations during 2014 in journals tracked by the Institute of Scientific Information, articles published in this journal in 2012-2013; B is the number of articles published in this journal in 2012-2013.

There are several nuances in the calculation: the Institute for Scientific Information excludes certain types of articles (messages, letters, errata lists, etc.) from calculations, and for new journals the impact factor is sometimes calculated only for biennia.

6.Explain the meaning of Hirsh index, give an example.

The h-index is an author-level metric that attempts to measure both the productivity and citation impact of the publications of a scientist or scholar. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications. The index can also be applied to the productivity and impact of a scholarly journal as well as a group of scientists, such as a department or university or country. The index was suggested in 2005 by Jorge E. Hirsch, a physicist at UCSD, as a tool for determining theoretical physicists' relative quality and is sometimes called the Hirsch index or Hirsch number.

The definition of the index is that a scholar with an index of h has published h papers each of which has been cited in other papers at least h times. Thus, the h-index reflects both the number of publications and the number of citations per publication. The index is designed to improve upon simpler measures such as the total number of citations or publications. The index works properly only for comparing scientists working in the same field; citation conventions differ widely among different fields.

Formally, if f is the function that corresponds to the number of citations for each publication, we compute the h index as follows. First we order the values of f from the largest to the lowest value. Then, we look for the last position in which f is greater than or equal to the position (we call h this position). For example, if we have a researcher with 5 publications A, B, C, D, and E with 10, 8, 5, 4, and 3 citations, respectively, the h index is equal to 4 because the 4th publication has 4 citations and the 5th has only 3. In contrast, if the same publications have 25, 8, 5, 3, and 3, then the index is 3 because the fourth paper has only 3 citations.

f(A)=10, f(B)=8, f(C)=5, f(D)=4, f(E)=3 → h-index=4

f(A)=25, f(B)=8, f(C)=5, f(D)=3, f(E)=3 → h-index=3

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