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Anker PowerCore 20100 (20100mAh 2ポート 超大容量 モバイルバッテリー)...
More product info From Anker

13% of potentially unnatural reviews removed (why?)
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Last Updated: Sep 10, 2019
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Note: While Amazon.co.jp claims 3,006 Reviews, we counted 3,008 available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

iPhone6Sの充電用に購入し... [Go to full review]
Aug 6, 2019      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 1.0)


Least Trusted Reviews

正月に購入したパナソニ... [Go to full review]
Apr 24, 2016      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Single-Day Reviewer (posted all reviews on Apr 24, 2016)
  • Brand Monogamist (2 of 2 reviews for this brand; avg rating: 5.0)
  • Overrepresented Participation (posted 2 Reviews)
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Fail Rating Trend

  • 5%
  • Created over 10 days

We counted 3,008 reviews for this product over the span of 1,476 days, an average of 2.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 8 or fewer reviews on any given day.

However, we see the following 10 days exceeding this threshold:In total, we found that 151 reviews were created on just 10 days. The reviews on these high volume days have rated this product an average of 4.5 while reviews from other days 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 reviews created on high volume days

from reviews created on normal volume days


4.5
4.3


Read more about our Rating Trend test.

Fail Brand Repeats

Brand Loyalists


205 of the 3,008 reviewers have reviewed multiple products but half or more of their reviews are for this brand. This is an excessively large percentage of Brand Loyalists which may indicate unnatural reviews.

from Brand Loyalists

from Non-Loyalists


4.5
4.3


Brand Monogamists


72 of the 3,008 reviewers have reviewed multiple products, but only for this brand. This is an excessively large percentage of Brand Monogamists which may indicate unnatural reviews.

from Brand Monogamists

from Non-Monogamists


4.3
4.3


Read more about our Brand Repeats test.

Fail Suspicious Reviewers

One-Hit Wonders


444 of the 3,008 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


4.1
4.4


Single-Day Reviewers


100 of the 3,008 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 27 deleted Reviews for this product, with an average rating of 2.4. 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.

2.4 average rating of deleted reviews

2.4


Show distribution of deleted reviews

Warn Reviewer Participation

  • 58%
  • 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 1739 reviewers (or 58%) 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

94 of the 3,008 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


4.0
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 Word Count Comparison
Word counts are approximated for Hanzi and Kanji


  • 23%
  • 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 678 reviews (or 23%) 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.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.2
4.3


Read more about our Word Count Comparison test.

Pass Overlapping Review History
  • 0%
  • Substantial overlapping review history
0 of the 3,008 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.