The Corruption Perceptions Index is published by Transparency index( the global collation against corruption) which ranks 180 countries and territories by their perceived levels of public sector corruption, according to experts and business people.
The CPI generally defines corruption as "the misuse of public power for private benefit".
How it is measured?
It gives each country a score from zero (highly corrupt) to 100 (very clean). The methodology for measuring CPI is based on selecting source data, rescaling source data, aggregating the rescaled data, and a statistical measure indicating the level of certainty.Transparency International used 16 assessments and surveys from 12 institutions as the basis for its country scores.In order to appear in the CPI, a country must be assessed by no less than three sources.
What new index says?
The average 2019 score is 43, with more than two-thirds of countries scoring below 50. This year Denmark and New Zealand has been ranked 1.
Corruption is more pervasive in countries where big money can flow freely into electoral campaigns and where governments listen only to the voices of wealthy or well-connected individuals
Major protests across the world last year signal a growing lack of trust in government, and erodes public confidence in political leaders, elected officials and democracy.
Case of India.
India has been ranked 80 with a score of 41, out of 180 countries, last year rank was 78. India and china has both ranked the same. India has emerged as most corrupt free among SAARC nations.