Review integrity
Grades a product's reviews A to F by stress-testing ratings across Amazon, Trustpilot, and forums with a Welch t-test and bimodality check. No LLM, fully reproducible.
{
"grade": "F",
"signals": [
{
"name": "cross_source_rating_divergence",
"verdict": "fail",
"evidence": {
"gap": 3.54,
"t_stat": 9.95,
"sources": [
"amazon",
"trustpilot"
]
}
},
{
"name": "distribution_bimodality",
"verdict": "warn",
"evidence": {
"bimodality_coefficient": 0.77
}
}
],
"per_source_ratings": [
{
"source": "amazon",
"value": 4.5,
"n": 10500
},
{
"source": "trustpilot",
"value": 1.33,
"n": 12
}
]
}