Although quantitative measurement of corruption is difficult, there are several reliable measures in use. ETICO provides easy access to the data produced by these measures developed by worldwide institutions (see table below).
Measures of corruption
Transparency International (TI)
Global Corruption Barometer (GCB):
GCB index: Perceived level of corruption in the education sector (1 = not at all corrupt ; 5 = extremely corrupt)
Percentage of persons having paid a bribe in education during the past 12 months grouped by income, age, and aggregated at the global and national level
The latest edition measures corruption levels in primary and secondary education on the one hand, and vocational education on the other
Annual survey results published online since 2003. The latest series of reports from 2015/16 reflects responses of more than 100,000 people in 100 countries