Take-Back Reviewers

• 
• 46%
• have previously deleted reviews

282 of the 615 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

Read more about our Suspicious Reviewers test.

• 
• 9%
• Created over 17 days

We counted 615 reviews for this product over the span of 4,395 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.

However, we see the following 17 days exceeding this threshold:

• 5 Reviews on Apr 27, 2016 (Avg. rating: 5.0)
• 4 Reviews on Sep 26, 2016 (Avg. rating: 5.0)
• 4 Reviews on Nov 8, 2016 (Avg. rating: 4.0)
• 3 Reviews on Aug 5, 2014 (Avg. rating: 5.0)
• 3 Reviews on Jul 3, 2016 (Avg. rating: 5.0)
• 3 Reviews on Oct 7, 2016 (Avg. rating: 5.0)
• 3 Reviews on Jun 11, 2017 (Avg. rating: 5.0)
• 3 Reviews on Sep 6, 2017 (Avg. rating: 5.0)
• 3 Reviews on Sep 12, 2017 (Avg. rating: 5.0)
• 3 Reviews on Jan 16, 2018 (Avg. rating: 5.0)
• 3 Reviews on Jan 10, 2016 (Avg. rating: 4.7)
• 3 Reviews on Feb 22, 2016 (Avg. rating: 4.7)
• 3 Reviews on Jun 27, 2016 (Avg. rating: 4.7)
• 3 Reviews on Jul 31, 2016 (Avg. rating: 4.7)
• 3 Reviews on May 30, 2017 (Avg. rating: 4.3)
• 3 Reviews on Oct 4, 2017 (Avg. rating: 4.3)
• 3 Reviews on Feb 20, 2017 (Avg. rating: 3.7)
Show All

In total, we found that 55 reviews were created on just 17 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.

Read more about our Rating Trend test.

Brand Repeaters

• 
• 37%
• Reviewed other products from this brand

228 of the 615 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.

• 
• 60%
• From reviewers with an overrepresented participation

We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:

• Reviewers with 6-15 Reviews: 20.8% (Avg. rating: 4.6)
• Reviewers with 16-30 Reviews: 22.0% (Avg. rating: 4.6)
• Reviewers with 31-50 Reviews: 16.9% (Avg. rating: 4.5)

In total, we found that 367 reviewers (or 60%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

Read more about our Reviewer Participation test.

• 
• 10%
• Unverified Purchases

61 of the 615 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.

• 
• 25%
• 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:

• 6-15 words: 25.2% (Avg. rating: 4.6)

In total, we found that 155 reviews (or 25%) 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.

Read more about our Word Count Comparison test.

• 
• 4%
• Used substantial repetitive phrases

27 of the 615 total reviews for this product use substantial repetitive phrases between them. 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 Phrase Repetition test.

• 
• 23%
• Substantial overlapping review history

139 of the 615 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.

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 4.3, while the average ease score for reviewers in this category is 4.3.

On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.

• 
• 0%
• Admitted to receiving an incentive

1 of the 615 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. 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 Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

• 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.