• 
• 7%
• Used substantial repetitive phrases

235 of the 3,290 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.4 while reviews without substantial repetitive phrases rated this product an average of 4.2. 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 Phrase Repetition test.

• 
• 6%
• Created over 35 days

We counted 3,290 reviews for this product over the span of 7,622 days, an average of 0.4 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.

However, we see the following 35 days exceeding this threshold:

• 11 Reviews on Feb 20, 2015 (Avg. rating: 3.6)
• 9 Reviews on Aug 9, 2016 (Avg. rating: 4.0)
• 7 Reviews on May 8, 2015 (Avg. rating: 4.6)
• 7 Reviews on Jan 3, 2017 (Avg. rating: 4.3)
• 7 Reviews on Oct 4, 2015 (Avg. rating: 4.1)
• 7 Reviews on Aug 10, 2016 (Avg. rating: 4.0)
• 6 Reviews on Jul 22, 2014 (Avg. rating: 4.5)
• 6 Reviews on Jun 8, 2015 (Avg. rating: 4.3)
• 6 Reviews on May 22, 2014 (Avg. rating: 4.2)
• 5 Reviews on Mar 2, 2005 (Avg. rating: 5.0)
• 5 Reviews on Jul 22, 2015 (Avg. rating: 4.8)
• 5 Reviews on Mar 3, 2016 (Avg. rating: 4.8)
• 5 Reviews on Jul 26, 2016 (Avg. rating: 4.8)
• 5 Reviews on Apr 19, 2017 (Avg. rating: 4.8)
• 5 Reviews on Jan 10, 2018 (Avg. rating: 4.8)
• 5 Reviews on Jan 11, 2018 (Avg. rating: 4.8)
• 5 Reviews on Jul 16, 2013 (Avg. rating: 4.6)
• 5 Reviews on Aug 15, 2016 (Avg. rating: 4.6)
• 5 Reviews on Oct 17, 2016 (Avg. rating: 4.6)
• 5 Reviews on Aug 2, 2014 (Avg. rating: 4.4)
• 5 Reviews on Jul 3, 2013 (Avg. rating: 4.4)
• 5 Reviews on Jan 3, 2015 (Avg. rating: 4.2)
• 5 Reviews on Aug 20, 2014 (Avg. rating: 4.2)
• 5 Reviews on May 3, 2009 (Avg. rating: 4.2)
• 5 Reviews on Nov 20, 2014 (Avg. rating: 4.0)
• 5 Reviews on Jul 15, 2016 (Avg. rating: 4.0)
• 5 Reviews on Jul 24, 2016 (Avg. rating: 3.8)
• 5 Reviews on Nov 1, 2016 (Avg. rating: 3.8)
• 5 Reviews on Jan 14, 2017 (Avg. rating: 3.8)
• 5 Reviews on Jan 20, 2016 (Avg. rating: 3.6)
• 5 Reviews on Aug 19, 2016 (Avg. rating: 3.6)
• 5 Reviews on Dec 27, 2014 (Avg. rating: 3.2)
• 5 Reviews on Mar 1, 2015 (Avg. rating: 3.2)
• 5 Reviews on Sep 25, 2014 (Avg. rating: 2.6)
• 5 Reviews on Sep 7, 2016 (Avg. rating: 2.4)
Show All

In total, we found that 196 reviews were created on just 35 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.

One-Hit Wonders

• 
• 15%
• have only posted one review

480 of the 3,290 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.

Take-Back Reviewers

• 
• 10%
• have previously deleted reviews

313 of the 3,290 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, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Suspicious Reviewers test.

• 
• 62%
• 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: 37.5% (Avg. rating: 4.2)
• Reviewers with 6-15 Reviews: 24.8% (Avg. rating: 4.3)

In total, we found that 2047 reviewers (or 63%) 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.

• 
• 47%
• Unverified Purchases

1,560 of the 3,290 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.

• 
• 19%
• 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:

• 16-25 words: 18.5% (Avg. rating: 4.2)

In total, we found that 609 reviews (or 19%) 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.

• 
• 17%
• Substantial overlapping review history

560 of the 3,290 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 4.2, while the average ease score for reviewers in this category is 4.2.

Brand Repeaters

• 
• 5%
• Reviewed other products from this brand

163 of the 3,290 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.