Earlier quoted context omitted.
Not clear how you will apply a scientific method to a site that can hide, convince, bribe, censor, etc users so the information you gather is incomplete to have a good analysis. More when people have a short focus span and a scientific method is complex.
This is just my personal interpretation, but the way I approach is I create a trustworthiness score for the set of reviews. For example, too many 5 stars without comments and without low stars might earn a low trustworthiness score because the distribution looks unnatural compared to the distribution in similar competitors. Or a set of 6 reviews, no matter their distribution will also receive a low trustworthiness sc…
Honestly, I don't see how to trust reviews if the reviewers have no skin in the game (either their reputation or money). If identities and reputations can be faked/generated at low cost, then we're back to just money. Honestly, one theory of advertising (like McD and bigC) is that they throw money at pretty ads to convince you that lots of people have given them money so they must be good... it's pay to play, but it's not completely wrong. Limiting reviews to those who have actually bought the item also helps, if you time limit/delay it and weight by the cost of shipping/stocking.