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Youmay 2019最新 頭皮・ヘッドマッサージャー 高品質 マッサージ器 IPX7...
More product info From YOUMAY

18% of potentially unnatural reviews removed (why?)
Adjusted:
Jump to Report Card

Report Info:

Report Card

Pass Overall Grade
FAIL Unverified Purchases
FAIL Suspicious Reviewers
FAIL Overlapping Review History
PASS Rating Trend
PASS Word Count Comparison
PASS Reviewer Ease
PASS Brand Repeats
PASS Deleted Reviews
N/A Phrase Repetition
N/A Reviewer Participation
N/A Incentivized Reviews

Most Trusted Reviews

 最近疲れがたまって... [Go to full review]
Aug 5, 2019      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
  • Easy Grader (avg. rating: 5.0)


Least Trusted Reviews

見た目より小型です... [Go to full review]
May 16, 2019      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Overrepresented word count (87 words)
  • Overrepresented Participation (posted 3 Reviews)
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Fail Unverified Purchases

26 of the 392 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.9 while the verified purchasers have rated this product an average of 4.5. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

from unverified purchasers

from verified purchases


4.9
4.5


Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.

Fail Suspicious Reviewers

One-Hit Wonders


Approximately 35% of reviewers have only reviewed this product. This is an excessively large percentage of One-Hit Wonders which may indicate unnatural reviews.

from one-hit wonders

from reviewers with more than one review


4.5
4.6


Read more about our Suspicious Reviewers test.

Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:

Does not include products
from the same brand


Approximately 15% of reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 5.0 while the reviewers who have a more unique product review history rated this product an average of 4.5. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


5.0
4.5


Read more about our Overlapping Review History test.

Pass Rating Trend
  • <10%
  • Created on high-volume days
We didn't notice any signals that would indicate reviews were created unevenly over time.
Read more about our Rating Trend test.

Pass Word Count Comparison
Word counts are approximated for Hanzi and Kanji


  • <10%
  • Have an overrepresented word count
We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.

Pass Reviewer Ease
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.4, while the average ease score for reviewers in this category is 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

4.4 Product's Average Ease Score

4.2 Category's Average Ease Score


4.4
4.2


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

Pass Deleted Reviews
  • 0
  • Reviews have been deleted
We have not discovered any deleted reviews for this product.

There are a few limitations to keep in mind regarding the Deleted Reviews test:
  1. We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
  2. We have no information on reviews that were never published in the first place.
  3. We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
Read more about our Deleted Reviews test.

N/A Phrase Repetition
We have not yet completed optimization for this test for Hanzi or Kanji.

N/A Reviewer Participation
We haven't collected sufficient data to run this test yet. more info

N/A Incentivized Reviews
We have not yet completed optimization for this test for Hanzi or Kanji.