The CPI is a composite index, a poll of polls, drawing on corruption-related data from expert and business surveys carried out by a variety of independent institutions. It reflects views from around the world, including those of experts who are living in the countries evaluated.
A higher score means a country with low level of perceived corruption.
Source: Transparency International http://www.nsd.uib.no/macrodataguide/set.html?id=40&sub=1
The box-plots below show more precisely the distribution of the CPI score with respect to the region
The following chart indicates the standard error for each country, grouped by region
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