Paradoxical Effectiveness of Vaccination

Data were retrieved 30/05/2021 from https://www.worldometers.info/coronavirus/weekly-trends/#weekly_table ("Cases in the last 7 days/1M population", "Deaths in the last 7 days/1M population", "Weekly Case % Change" and "Weekly Death % Change") and from https://ourworldindata.org/grapher/covid-vaccination-doses-per-capita?tab=map "COVID-19 vaccine doses administered per 100 people, May 29, 2021" and Share of the population fully vaccinated against COVID-19 https://ourworldindata.org/grapher/share-people-fully-vaccinated-covid.

The data was cleaned from countries where there are no data or where the statistics looks as unreliable (e.g. most African countries). After this 102 countries for "Fully vaccinated" and 111 countries for "Vaccine doses" were left. 8 coefficients of correlation were calculated, the results are below.

Just one example to illustrate these results: champion Israel fully vaccinated 59% and as if finished pandemics, Bahrain is on second place 45% and one of the highest number of new cases.

In general, we do not see any negative correlation as it'd be expected. Moreover, obvious positive correlation exists between vaccination and the number of cases. We cannot understand causal relationship – what is cause and what is effect: either vaccination increases number of cases or vice versa. But this is the case we observe and must try to understand.

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