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【進化版】Helius 自転車 ライト バルブライト usb充電式...
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Amazon Reviews for  【進化版】Helius 自転車 ライト バルブライト usb充電式 フロント【光センサー自動点灯モード搭載】 4段階点灯モード 高輝度1000ルーメン PSE認証済 自転車用ヘッドライト ホルダー 懐中電灯 led兼用 小型 IPX6防水 スポーツ&アウトドア 自転車・サイクリング 用 ライト 停電対応 地震対策 登山 夜釣り 日本語説明書付き
Rating:
725 Ratings
347 Reviews
("Ratings" vs. "Reviews")
15% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Oct 14, 2020
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Note: While Amazon.co.jp claims 725 Ratings, we counted 347 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

4/5
User did not leave written text for this review. [Go to full review]
Mar 26, 2020      
73% TRUST
  • Verified Purchaser
  • Overrepresented word count (0 words)
  • Easy Grader (avg. rating: 4.4)


Least Trusted Reviews

4/5
User did not leave written text for this review. [Go to full review]
Dec 18, 2019      
0% TRUST
  • Verified Purchaser
  • Overrepresented word count (0 words)
  • Overlapping Review History: reviewed 1 of 9 top products
  • Overrepresented Participation (posted 18 Reviews)
  • Critical Reviewer (avg. rating: 3.9)


Analysis Details

Fail Deleted Reviews

We discovered a total of 169 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 our Deleted Reviews test.

5.0 average rating of deleted reviews

5.0


Show distribution of deleted reviews

Fail Suspicious Reviewers

One-Hit Wonders


31 of the 347 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 2.3 while the reviewers who have posted more than one review have rated this product an average of 3.4. 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 one-hit wonders

from reviewers with more than one review


2.3
3.4


Read more about our Suspicious Reviewers test.

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

1% also reviewed:
Fire TV Stick -... by

1% also reviewed:
Arti Cipes... by Arti Cipes

Does not include products
from the same brand


21 of the 347 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.0 while the reviewers who have a more unique product review history rated this product an average of 3.3. 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


4.0
3.3


Read more about our Overlapping Review History test.

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


  • 98%
  • 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 340 reviews (or 98%) 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


3.3
2.9


Read more about our Word Count Comparison test.

Warn Reviewer Participation

  • 82%
  • From reviewers with an overrepresented participation

We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 285 reviewers (or 82%) 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


3.3
3.6


Read more about our Reviewer Participation test.

Pass Rating Trend

  • 0%
  • Created over 1 day
We counted 347 reviews for this product over the span of 524 days, an average of 0.7 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 5 or fewer reviews on any given day.

However, we see the following 1 day exceeding this threshold:In total, we found that 0 reviews were created on just 1 day. 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 Rating Trend test.

Pass Unverified Purchases

11 of the 347 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


2.8
3.3


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 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 3.5, while the average ease score for reviewers in this category is 4.2.

3.5 Product's Average Ease Score

4.2 Category's Average Ease Score


3.5
4.2


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Loyalists


1 of the 347 reviewers have reviewed multiple products but half or more of their reviews are 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 Loyalists

from Non-Loyalists


2.0
3.3


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.