2.3 Citation impact

The average number of citations per publication is used for assessing the scientific impact of publications, especially at a country level. This indicator – henceforth referred to as “citation impact”– is calculated as the ratio of the total number of citations to the total number of publications, without taking into account differences in citation practices among scientific fields.

Figure 2.3.1 presents the citation impact of Greek, EU and OECD publications. In the most recent 5-year period, 2014-2018, Greek publications received 8.10 citations on average, exceeding the EU (6.90) and OECD (6.70) average. Notably, for the entire 2004-2018 period the citation impact rate of Greek publications has been consistently higher than that of both the EU and OECD (Figure 2.3.2).

Figure 2.3.1



Figure 2.3.2

Rate of change: 1 + [(number of publications in year “n” – number of publications in year “n-1”)/ number of publications in year “n-1”]. The rate is 1, if the number of publications is the same across the years compared.



The “relative impact” indicator, as shown in Figure 2.3.3, compares citations -per-publication average for Greece against the EU and OECD. Greece’s citation impact relative to the EU and OECD has been exhibiting an ascending trend between 2004-2018. In the most recent 5-year period, 2014-2018, Greece’s citation impact still overtooks that of the EU (1.17) and OECD (1.21). 


Figure 2.3.3



In terms of its relative citation impact in the 5-year period 2014-2018, Greece was ranked 19th among the OECD countries with 1,21 (Figure 2.3.4).


Figure 2.3.4

Data for Iceland and Luxembourg missing because of small number of publications (less than 1,000).