Take-Back Reviewers

• 
• 50%
• have previously deleted reviews

369 of the 733 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 4.3 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.1. 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.

• 
• 23%
• Substantial overlapping review history

168 of the 733 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.6 while the reviewers who have a more unique product review history rated this product an average of 4.1. 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.

• 8
• Reviews have been deleted

We discovered a total of 8 deleted Reviews for this product, with an average rating of 4.4. 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.

Show distribution of deleted reviews

• 
• 8%
• Created over 17 days

We counted 733 reviews for this product over the span of 6,635 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 Mar 30, 2015 (Avg. rating: 4.8)
• 5 Reviews on Apr 20, 2015 (Avg. rating: 4.4)
• 4 Reviews on Mar 1, 2015 (Avg. rating: 5.0)
• 4 Reviews on Jan 12, 2015 (Avg. rating: 4.8)
• 4 Reviews on Jul 9, 2013 (Avg. rating: 4.3)
• 4 Reviews on Apr 23, 2015 (Avg. rating: 4.3)
• 4 Reviews on Jan 7, 2014 (Avg. rating: 3.3)
• 3 Reviews on Apr 29, 2014 (Avg. rating: 5.0)
• 3 Reviews on Jul 25, 2014 (Avg. rating: 5.0)
• 3 Reviews on Jun 17, 2013 (Avg. rating: 4.7)
• 3 Reviews on Jul 28, 2014 (Avg. rating: 4.7)
• 3 Reviews on Jan 16, 2015 (Avg. rating: 4.7)
• 3 Reviews on Feb 24, 2015 (Avg. rating: 4.7)
• 3 Reviews on Jun 10, 2015 (Avg. rating: 4.7)
• 3 Reviews on Aug 21, 2014 (Avg. rating: 4.0)
• 3 Reviews on Jun 6, 2014 (Avg. rating: 3.7)
• 3 Reviews on Jun 9, 2014 (Avg. rating: 3.7)
Show All

In total, we found that 60 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.

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. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

• 
• 8%
• Unverified Purchases

60 of the 733 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.

• 
• 0%
• Have an overrepresented word count

We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.

• 
• 7%
• Used substantial repetitive phrases

53 of the 733 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.

• 
• 0%
• From reviewers with an overrepresented participation

We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

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 733 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.