• 
• 27%
• Created over 12 days

We counted 398 reviews for this product over the span of 401 days, an average of 1.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 6 or fewer reviews on any given day.

However, we see the following 12 days exceeding this threshold:

• 14 Reviews on Jun 14, 2020 (Avg. rating: 4.1)
• 12 Reviews on Jun 15, 2020 (Avg. rating: 4.5)
• 11 Reviews on Jun 16, 2020 (Avg. rating: 4.4)
• 11 Reviews on Jun 17, 2020 (Avg. rating: 4.3)
• 8 Reviews on Jun 12, 2020 (Avg. rating: 4.9)
• 8 Reviews on Jun 8, 2020 (Avg. rating: 4.5)
• 8 Reviews on Aug 10, 2020 (Avg. rating: 3.4)
• 7 Reviews on Jun 7, 2020 (Avg. rating: 4.7)
• 7 Reviews on Jun 6, 2020 (Avg. rating: 4.6)
• 7 Reviews on Jul 20, 2020 (Avg. rating: 4.4)
• 7 Reviews on Jun 13, 2020 (Avg. rating: 4.0)
• 7 Reviews on Aug 11, 2020 (Avg. rating: 3.3)
Show All

In total, we found that 107 reviews were created on just 12 days. The reviews on these high volume days have rated this product an average of 4.3 while reviews from other days 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.

Read more about our Rating Trend test.

Take-Back Reviewers

• 
• 38%
• have previously deleted reviews

152 of the 398 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 4.4 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 3.9. 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.

Read more about our Suspicious Reviewers test.

• 
• 43%
• Substantial overlapping review history

172 of the 398 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.4 while the reviewers who have a more unique product review history rated this product an average of 3.8. 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.

Read more about our Overlapping Review History test.

• 
• 19%
• 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:

• Reviewers with 101-200 Reviews: 19.4% (Avg. rating: 4.4)

In total, we found that 77 reviewers (or 19%) are within an overrepresented participation group. These reviews have rated this product an average of 4.4, while all other reviews 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.

Read more about our Reviewer Participation test.

Brand Repeaters

• 
• 31%
• Reviewed other products from this brand

123 of the 398 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, the discrepancy in ratings between the Brand Repeaters and non-repeaters isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Brand Repeats test.

• 
• 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:

• 0-5 words: 98.7% (Avg. rating: 4.1)

In total, we found that 393 reviews (or 99%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.

Read more about our Word Count Comparison test.

• 
• 0%
• Unverified Purchases

1 of the 398 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.

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

• 0
• Reviews have been deleted

We have not discovered any deleted reviews for this product.

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.

We have not yet completed optimization for this test for Hanzi or Kanji.

We have not yet completed optimization for this test for Hanzi or Kanji.