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Ouday 脱毛器 レディース 光美容器 永久脱毛 IPL技術 全身 レーザー...
More product info From Ouday

Amazon Reviews for Ouday 脱毛器 レディース 光美容器 永久脱毛 IPL技術 全身 レーザー 35万発照射 家庭用 日本語説明書
Rating:
3,250 Reviews
92% of potentially unnatural reviews removed (Why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Jun 7, 2019
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Show Report History
Note: While Amazon.co.jp claims 3,250 reviews, we counted 3,286 available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

操作が簡単で値段も手頃... [Go to full review]
Jun 2, 2019      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 4.0)


Least Trusted Reviews

この脱毛器は値段が安く... [Go to full review]
May 23, 2019      
0% TRUST
  • Unverified Purchaser
  • Created on a high volume day
  • Overrepresented word count (29 words)
  • One-Hit Wonder
  • Never-Verified Reviewer
  • Overrepresented Participation (posted 1 review)
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Fail Deleted Reviews

We discovered a total of 442 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

Fail Unverified Purchases

45 of the 3,286 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.1 while the verified purchasers have rated this product an average of 5.0. 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


4.1
5.0


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


2,563 of the 3,286 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


5.0
4.9


Never-Verified Reviewers


40 of the 3,286 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 4.3 while the reviewers who have written at least one verified purchase review rated this product an average of 5.0. 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 never-verified reviewers

from reviewers with at least one verified purchase review


4.3
5.0


Take-Back Reviewers


58 of the 3,286 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from take-back reviewers

from reviewers without previously deleted reviews


5.0
5.0


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 5, 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.

5.0 Product's Average Ease Score

4.2 Category's Average Ease Score


5.0
4.2


Read more about our Reviewer Ease test.


Warn Rating Trend

from reviews created on high volume days

from reviews created on normal volume days


5.0
4.9


Read more about our Rating Trend test.

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


  • 50%
  • 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 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 1,647 reviews (or 50%) 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


5.0
5.0


Read more about our Word Count Comparison test.

Warn Reviewer Participation

  • 81%
  • 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 2657 reviewers (or 81%) 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


5.0
5.0


Read more about our Reviewer Participation test.

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

3% also reviewed:
松川匠 by Vinada

Does not include products
from the same brand


376 of the 3,286 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


5.0
5.0


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters


3 of the 3,286 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from Brand Repeaters

from Non-Repeaters


5.0
5.0


Read more about our Brand Repeats test.

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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