One-Hit Wonders

• 
• 8%
• have only posted one review

60 of the 720 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 4.6 while the reviewers who have posted more than one review have rated this product an average of 4.4. 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

• 
• 5%
• have previously deleted reviews

33 of the 720 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Read more about our Suspicious Reviewers test.

• 
• 65%
• 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 3 groups with a statistically significant greater concentration than what we'd expect to see:

• 16-25 words: 19.3% (Avg. rating: 4.6)
• 26-40 words: 25.1% (Avg. rating: 4.5)
• 41-65 words: 20.8% (Avg. rating: 4.5)

In total, we found that 470 reviews (or 65%) are within an overrepresented word count group. These reviews have rated this product an average of 4.5, while all other reviews 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.

Read more about our Word Count Comparison test.

• 
• 72%
• From reviewers with an overrepresented participation

We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:

• Reviewers with 1-5 Reviews: 39.7% (Avg. rating: 4.5)
• Reviewers with 6-15 Reviews: 32.6% (Avg. rating: 4.5)

In total, we found that 521 reviewers (or 72%) are within an overrepresented participation group. These reviews have rated this product an average of 4.5, while all other reviews 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.

Read more about our Reviewer Participation test.

• 
• 23%
• Created over 46 days

We counted 720 reviews for this product over the span of 7,002 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 46 days exceeding this threshold:

• 10 Reviews on May 16, 2014 (Avg. rating: 4.3)
• 7 Reviews on May 22, 2014 (Avg. rating: 4.3)
• 6 Reviews on Jan 8, 2015 (Avg. rating: 4.5)
• 6 Reviews on Feb 20, 2015 (Avg. rating: 4.5)
• 5 Reviews on Jan 17, 2015 (Avg. rating: 5.0)
• 5 Reviews on May 26, 2014 (Avg. rating: 5.0)
• 5 Reviews on Jun 8, 2014 (Avg. rating: 4.4)
• 5 Reviews on Jan 4, 2015 (Avg. rating: 4.0)
• 4 Reviews on Mar 2, 2015 (Avg. rating: 5.0)
• 4 Reviews on Jun 3, 2014 (Avg. rating: 4.3)
• 4 Reviews on Oct 2, 2014 (Avg. rating: 4.3)
• 4 Reviews on Jul 20, 2014 (Avg. rating: 4.0)
• 4 Reviews on May 27, 2014 (Avg. rating: 3.8)
• 3 Reviews on May 10, 2014 (Avg. rating: 5.0)
• 3 Reviews on May 30, 2014 (Avg. rating: 5.0)
• 3 Reviews on Jun 2, 2014 (Avg. rating: 5.0)
• 3 Reviews on Mar 1, 2015 (Avg. rating: 5.0)
• 3 Reviews on Jan 9, 2015 (Avg. rating: 5.0)
• 3 Reviews on May 21, 2014 (Avg. rating: 4.7)
• 3 Reviews on May 13, 2014 (Avg. rating: 4.7)
• 3 Reviews on Jun 4, 2014 (Avg. rating: 4.7)
• 3 Reviews on Mar 14, 2013 (Avg. rating: 4.7)
• 3 Reviews on Jan 24, 2015 (Avg. rating: 4.7)
• 3 Reviews on Jul 2, 2014 (Avg. rating: 4.7)
• 3 Reviews on May 17, 2015 (Avg. rating: 4.7)
• 3 Reviews on Nov 14, 2012 (Avg. rating: 4.7)
• 3 Reviews on Jan 6, 2015 (Avg. rating: 4.7)
• 3 Reviews on Jun 30, 2013 (Avg. rating: 4.3)
• 3 Reviews on Jan 7, 2013 (Avg. rating: 4.3)
• 3 Reviews on Jul 10, 2014 (Avg. rating: 4.3)
• 3 Reviews on Jan 3, 2015 (Avg. rating: 4.3)
• 3 Reviews on Jun 21, 2017 (Avg. rating: 4.3)
• 3 Reviews on Oct 6, 2012 (Avg. rating: 4.0)
• 3 Reviews on Feb 21, 2015 (Avg. rating: 4.0)
• 3 Reviews on Jun 5, 2014 (Avg. rating: 4.0)
• 3 Reviews on Mar 22, 2015 (Avg. rating: 4.0)
• 3 Reviews on Jan 2, 2013 (Avg. rating: 4.0)
• 3 Reviews on Jan 12, 2015 (Avg. rating: 3.7)
• 3 Reviews on Jul 24, 2014 (Avg. rating: 3.7)
• 3 Reviews on Jun 20, 2014 (Avg. rating: 3.7)
• 3 Reviews on Jun 7, 2014 (Avg. rating: 3.7)
• 3 Reviews on Feb 25, 2015 (Avg. rating: 3.7)
• 3 Reviews on Jul 9, 2015 (Avg. rating: 3.7)
• 3 Reviews on May 12, 2014 (Avg. rating: 3.3)
• 3 Reviews on Mar 6, 2015 (Avg. rating: 3.3)
• 3 Reviews on Jul 7, 2014 (Avg. rating: 3.0)
Show All

In total, we found that 168 reviews were created on just 46 days. This is an excessively high number of reviews submitted on these high volume days.

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.

• 
• 32%
• Unverified Purchases

227 of the 720 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.

• 
• 11%
• Used substantial repetitive phrases

77 of the 720 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.

• 
• 19%
• Substantial overlapping review history

135 of the 720 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

2 of the 720 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.