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"Perceptions are used because corruption – whether frequency or amount – is to a great extent a hidden activity that is difficult to measure. Over time, perceptions have proved to be a reliable estimate of corruption."
Read the methodologies used, and sources of data first, rather than just trigger on a word used in the title. In this case "Perception" doesn't mean they just made shit up. It means they're trying to be honest about their accuracy not including hidden sources of corruption, etc...
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