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完全ワイヤレス イヤホン Bluetooth イヤホン Bluetooth 5.0 IPX5 ブルートゥース...
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From idudu
This report was last updated 7/11/2020.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: While Amazon.co.jp claims 321 Ratings, we counted 1,106 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Warn Overall Grade
FAIL
Suspicious Reviewers

WARN
Deleted Reviews

WARN
Rating Trend

WARN
Reviewer Participation

PASS
Unverified Purchases

PASS
Word Count Comparison

PASS
Overlapping Review History

PASS
Reviewer Ease

PASS
Brand Repeats

N/A
Phrase Repetition

N/A
Incentivized Reviews

Most Trusted Reviews
User did not leave written text for this review. [Go to full review]
Mar 25, 2019
100%
TRUST
TRUST
-
Verified Purchaser
-
Overrepresented word count (0 words)
-
Critical Reviewer (avg. rating: 2.2)
Least Trusted Reviews
User did not leave written text for this review. [Go to full review]
Jul 19, 2018
0%
TRUST
TRUST
-
Unverified Purchaser
-
Created on a high volume day
-
Overrepresented word count (0 words)
-
Overrepresented Participation (posted 2 Reviews)
-
Critical Reviewer (avg. rating: 3.0)
Analysis Details
Fail
Suspicious Reviewers

One-Hit Wonders
272 of the 1,106 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 4.2 while the reviewers who have posted more than one review have rated this product an average of 4.0. 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.
Never-Verified Reviewers
55 of the 1,106 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 4.5 while the reviewers who have written at least one verified purchase review rated this product an average of 4.0. 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.
Take-Back Reviewers
83 of the 1,106 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.6 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.0. 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.
Single-Day Reviewers
12 of the 1,106 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 3.3 while all other reviewers rated this product an average of 4.0. 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.
Warn
Deleted Reviews

We discovered a total of 24 deleted Reviews for this product, with an average rating of 4.7. 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:
- 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.
- We have no information on reviews that were never published in the first place.
- 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.
Warn
Rating Trend

-
- 19%
- Created over 22 days
We counted 1,106 reviews for this product over the span of 784 days, an average of 1.4 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 7 or fewer reviews on any given day.
However, we see the following 22 days exceeding this threshold:In total, we found that 212 reviews were created on just 22 days. This is an excessively high number of reviews submitted on these high volume days.
Warn
Reviewer Participation

-
- 61%
- 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 670 reviewers (or 61%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass
Unverified Purchases

91 of the 1,106 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.
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
Word Count Comparison

Word counts are approximated for Hanzi and Kanji
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- 29%
- 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 320 reviews (or 29%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass
Overlapping Review History

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- 0%
- Substantial overlapping review history
0 of the 1,106 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.
Read more about our Overlapping Review History test.
Read more about our Overlapping Review History 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 4.2, while the average ease score for reviewers in this category is 4.2.
4.2 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass
Brand Repeats

Brand Repeaters
23 of the 1,106 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.
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.