One-Hit Wonders

• 
• 13%
• have only posted one review

609 of the 4,807 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.

Never-Verified Reviewers

• 
• 0%
• have zero verified purchases

16 of the 4,807 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 3.9 while the reviewers who have written at least one verified purchase review rated this product an average of 4.8. 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.

Take-Back Reviewers

• 
• 13%
• have previously deleted reviews

638 of the 4,807 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.

• 
• 6%
• Created over 20 days

We counted 4,807 reviews for this product over the span of 1,533 days, an average of 3.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 10 or fewer reviews on any given day.

However, we see the following 20 days exceeding this threshold:

• 18 Reviews on Dec 2, 2015 (Avg. rating: 4.8)
• 17 Reviews on Dec 31, 2015 (Avg. rating: 4.9)
• 16 Reviews on Jan 20, 2016 (Avg. rating: 5.0)
• 16 Reviews on Jan 13, 2016 (Avg. rating: 4.8)
• 16 Reviews on Dec 28, 2015 (Avg. rating: 4.7)
• 15 Reviews on Jan 5, 2016 (Avg. rating: 4.9)
• 15 Reviews on Dec 30, 2015 (Avg. rating: 4.8)
• 14 Reviews on Nov 17, 2015 (Avg. rating: 5.0)
• 13 Reviews on Dec 17, 2015 (Avg. rating: 4.6)
• 13 Reviews on Jan 2, 2016 (Avg. rating: 4.5)
• 12 Reviews on Feb 17, 2016 (Avg. rating: 5.0)
• 12 Reviews on Jan 12, 2018 (Avg. rating: 5.0)
• 12 Reviews on Jan 12, 2016 (Avg. rating: 4.9)
• 12 Reviews on Mar 24, 2016 (Avg. rating: 4.9)
• 11 Reviews on Nov 7, 2015 (Avg. rating: 5.0)
• 11 Reviews on Nov 28, 2015 (Avg. rating: 4.9)
• 11 Reviews on Dec 29, 2015 (Avg. rating: 4.9)
• 11 Reviews on Dec 15, 2015 (Avg. rating: 4.6)
• 11 Reviews on Jan 3, 2016 (Avg. rating: 4.6)
• 11 Reviews on Feb 25, 2016 (Avg. rating: 4.5)
Show All

In total, we found that 267 reviews were created on just 20 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.

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 4.5, while the average ease score for reviewers in this category is 4.4. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

• 
• 43%
• 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 1-5 Reviews: 42.9% (Avg. rating: 4.7)

In total, we found that 2062 reviewers (or 43%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.

Read more about our Reviewer Participation test.

• 
• 2%
• Unverified Purchases

103 of the 4,807 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.

• 
• 0%
• Used substantial repetitive phrases

9 of the 4,807 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.

• 
• 15%
• Substantial overlapping review history

737 of the 4,807 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.

Brand Repeaters

• 
• 0%
• Reviewed other products from this brand

3 of the 4,807 reviewers have reviewed other products for this brand. 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 Brand Repeats test.

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

We didn't detect any reviews that used language indicating they were incentivized.
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.