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美顔ローラー soafiya Y字美容ローラー マッサージローラー...
More product info From soafiya

Amazon Reviews for 美顔ローラー soafiya Y字美容ローラー マッサージローラー フェイス&ボディ ビューティ ローラー マイクロカレント 美顔器 美肌 むくみ防止  マッサージローラー Y字美顔器 美容/美顔/充電不要美肌ローラー 【メーカー純正品[1年保証]】 (美顔ローラー)
Rating:
270 Reviews
89% of potentially unnatural reviews removed (Why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Feb 18, 2019
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Note: While Amazon.co.jp claims 270 reviews, we counted 216 available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

箱自体は割としっかりし... [Go to full review]
Sep 8, 2018      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (1 deleted review; avg. rating: 5.0)
  • Critical Reviewer (avg. rating: 4.0)


Least Trusted Reviews

重さが少しあるかなーっ... [Go to full review]
Feb 10, 2019      
0% TRUST
  • Verified Purchaser
  • Overrepresented word count (49 words)
  • Overrepresented Participation (posted 22 reviews)
  • Easy Grader (avg. rating: 4.6)


Analysis Details

Fail Suspicious Reviewers

One-Hit Wonders


172 of the 216 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


4.3
4.5


Read more about our Suspicious Reviewers test.

Fail 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. 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.

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.


Warn Deleted Reviews

We discovered a total of 3 deleted reviews for this product, with an average rating of 5. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.

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 the Deleted Reviews test here.

5.0 average rating of deleted reviews

5.0


Show distribution of deleted reviews

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


  • 57%
  • Have an overrepresented word count

In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 2 groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 123 reviews (or 57%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.3
4.3


Read more about our Word Count Comparison test.

Warn Reviewer Participation

  • 98%
  • From reviewers with an overrepresented participation

We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 212 reviewers (or 98%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.3
4.5


Read more about our Reviewer Participation test.

Pass Rating Trend

  • 0%
  • Created on high-volume days
We counted 216 reviews for this product over the span of 210 days, an average of 1.0 review per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 6 or fewer reviews on any given day. We didn't find any days exceeding this threshold.
Read more about our Rating Trend test.

Pass Unverified Purchases

15 of the 216 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from unverified purchasers

from verified purchases


4.7
4.3


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.

Pass Overlapping Review History

2 of the 216 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.5
4.3


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters

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

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

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


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