I'm a little curious, but how is this percentage determined?
My guess is it's a guess 
In English: an educated guess.
In Dutch: natte vinger werk (lick your finger, stick it up, and feel how windy it is).
Is there an application for that, and what does the algorithm look like by which something abstractly like this is converted into percentages?
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The good thing is that he didn't put his hand in anyone's wallet
Good point. Even though it seems crazy to destroy his reputation this way, at least it's (more or less) victimless.