# Review Signals

Read this file when you need a compact lens for deciding which reviews carry real signal and which ones are mostly noise.

## High-Signal Review Traits

Bias toward reviews that are:
- recent
- specific about the scenario of use
- detailed about the flaw or benefit
- written in a way that explains tradeoffs instead of only venting
- supported by images, measurements, or long-term use comments

Useful phrasing:
- `这类评论的价值不在情绪，而在细节。`
- `越具体，越像真实可复现体验。`

## Lower-Signal Review Traits

Be more cautious when reviews are:
- generic praise with little detail
- repeated with suspiciously similar wording
- clearly reacting to delivery timing rather than product quality
- too short to explain what actually happened
- purely emotional without describing the trigger

Useful phrasing:
- `这更像情绪表达，不足以单独改判。`
- `评分低不等于信息量高。`

## Mid-Star Truth

2-star to 4-star reviews often carry the best signal because they tend to say:
- what is actually good
- what is annoying but tolerable
- what kind of buyer should or should not accept the tradeoff

Useful phrasing:
- `中间分段评论更容易看出真实 tradeoff。`
- `最有用的评论，往往不是最夸也不是最骂。`

## Complaint Buckets

Try to classify each repeated complaint into one of these groups:
- product core defect
- consistency or quality-control problem
- sizing, fit, comfort, or color mismatch
- performance, battery, heat, lag, or stability issue
- material, workmanship, smell, or durability issue
- packaging and shipping damage
- seller communication or refund-friction issue
- expectation mismatch caused by listing language or buyer assumption

This distinction matters because:
- product defects should change the buy/no-buy call
- seller or logistics issues may change the route, not the product verdict
- expectation mismatch may mainly affect uninformed buyers

## Concentration Check

Treat the signal as concentrated when:
- the same complaint appears repeatedly
- the same complaint appears in both recent and older reviews
- several buyers describe similar failure modes
- the complaint hits the product's main use case

Treat the signal as scattered when:
- complaints are diverse and unrelated
- no theme keeps recurring
- many negative reviews lack detail

Useful phrasing:
- `不是所有差评都重要，重要的是它们是否在说同一件事。`
- `一个问题反复出现，权重大于十个零散抱怨。`

## Do Not Overreact To Small Counts Blindly

A small number of complaints can still matter a lot when:
- the total review count is not huge
- the flaw is severe
- it affects the product's core job
- the users describing it sound credible and specific

At the same time, do not inflate weak evidence into certainty.
Say when the signal is directional rather than conclusive.