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Anker PowerCore 10000 (10000mAh 最小最軽量 大容量...
More product info From Anker

19% of potentially unnatural reviews removed (Why?)
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Report Info:
Last Updated: Mar 25, 2020
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Note: While Amazon.co.jp claims 7,727 reviews, we counted 7,745 available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

It doesn't... [Go to full review]
Feb 13, 2020      
100% TRUST
  • Verified Purchaser
  • Easy Grader (avg. rating: 5.0)


Least Trusted Reviews

4/5
User did not leave written text for this review. [Go to full review]
Apr 19, 2017      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Overrepresented word count (0 words)
  • Take-Back Reviewer (1 deleted review; avg. rating: 4.0)
  • Brand Loyalist (2 of 3 reviews for this brand; avg rating: 4.0)
  • Overrepresented Participation (posted 3 reviews)
  • Easy Grader (avg. rating: 4.3)


Analysis Details

Fail Suspicious Reviewers

One-Hit Wonders


1,028 of the 7,745 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from one-hit wonders

from reviewers with more than one review


4.0
4.4


Take-Back Reviewers


224 of the 7,745 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 4.5 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.3. 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 take-back reviewers

from reviewers without previously deleted reviews


4.5
4.3


Single-Day Reviewers


121 of the 7,745 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 4.6 while all other reviewers rated this product an average of 4.3. 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 single-day reviewers

from non-single-day reviewers


4.6
4.3


Read more about our Suspicious Reviewers test.

Warn Deleted Reviews

We discovered a total of 52 deleted reviews for this product, with an average rating of 4.1. 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.

4.1 average rating of deleted reviews

4.1


Show distribution of deleted reviews

Warn Rating Trend

  • 8%
  • Created over 31 days

We counted 7,745 reviews for this product over the span of 1,493 days, an average of 5.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 14 or fewer reviews on any given day.

However, we see the following 31 days exceeding this threshold:In total, we found that 634 reviews were created on just 31 days. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.

from reviews created on high volume days

from reviews created on normal volume days


4.4
4.3


Read more about our Rating Trend test.

Warn Brand Repeats

Brand Loyalists


186 of the 7,745 reviewers have reviewed multiple products but half or more of their reviews are for this brand. While this is more Brand Loyalists than we'd expect to see, the discrepancy in ratings between the Brand Loyalists and non-loyalists isn't significant enough to rule out the possibility of it being due to random chance.

from Brand Loyalists

from Non-Loyalists


4.5
4.3


Read more about our Brand Repeats test.

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


  • 99%
  • 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 7,673 reviews (or 99%) 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
4.1


Read more about our Word Count Comparison test.

Warn Reviewer Participation

  • 80%
  • 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 6187 reviewers (or 80%) 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
4.4


Read more about our Reviewer Participation test.

Pass Unverified Purchases

320 of the 7,745 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


4.3
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
  • 0%
  • Substantial overlapping review history
0 of the 7,745 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.

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


4.2
4.2


Read more about our Reviewer Ease 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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