• 
• 5%
• Created over 34 days

We counted 8,406 reviews for this product over the span of 2,484 days, an average of 3.4 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 11 or fewer reviews on any given day.

However, we see the following 34 days exceeding this threshold:

• 19 reviews on Jun 4, 2015 (Avg. rating: 3.8)
• 18 reviews on Feb 4, 2015 (Avg. rating: 4.2)
• 16 reviews on Apr 6, 2015 (Avg. rating: 4.4)
• 15 reviews on Feb 6, 2015 (Avg. rating: 4.7)
• 15 reviews on Apr 29, 2015 (Avg. rating: 4.5)
• 15 reviews on Mar 1, 2016 (Avg. rating: 4.2)
• 15 reviews on Feb 23, 2015 (Avg. rating: 4.2)
• 14 reviews on Dec 15, 2014 (Avg. rating: 4.5)
• 14 reviews on Oct 7, 2015 (Avg. rating: 4.3)
• 14 reviews on Apr 8, 2015 (Avg. rating: 4.3)
• 14 reviews on Aug 9, 2013 (Avg. rating: 4.3)
• 14 reviews on Jan 7, 2014 (Avg. rating: 4.1)
• 14 reviews on Feb 19, 2015 (Avg. rating: 4.1)
• 13 reviews on Jul 25, 2014 (Avg. rating: 4.3)
• 13 reviews on Aug 24, 2014 (Avg. rating: 4.3)
• 13 reviews on Apr 2, 2015 (Avg. rating: 4.3)
• 13 reviews on Feb 22, 2015 (Avg. rating: 4.3)
• 13 reviews on Oct 2, 2013 (Avg. rating: 4.2)
• 13 reviews on Mar 2, 2015 (Avg. rating: 4.2)
• 13 reviews on Dec 9, 2014 (Avg. rating: 3.9)
• 13 reviews on Jan 9, 2015 (Avg. rating: 3.8)
• 12 reviews on Feb 28, 2016 (Avg. rating: 4.8)
• 12 reviews on Jan 1, 2015 (Avg. rating: 4.7)
• 12 reviews on Aug 27, 2014 (Avg. rating: 4.6)
• 12 reviews on Feb 17, 2015 (Avg. rating: 4.4)
• 12 reviews on Aug 28, 2014 (Avg. rating: 4.3)
• 12 reviews on Apr 9, 2015 (Avg. rating: 4.3)
• 12 reviews on Sep 14, 2015 (Avg. rating: 4.3)
• 12 reviews on Feb 13, 2015 (Avg. rating: 4.2)
• 12 reviews on Jan 27, 2016 (Avg. rating: 4.2)
• 12 reviews on Apr 4, 2015 (Avg. rating: 4.0)
• 12 reviews on Feb 15, 2015 (Avg. rating: 3.9)
• 12 reviews on Jul 19, 2014 (Avg. rating: 3.6)
• 12 reviews on Nov 17, 2014 (Avg. rating: 3.4)
Show All

In total, we found that 457 reviews were created on just 34 days. The reviews on these high volume days have rated this product an average of 4.2 while reviews from other days have rated this product an average of 4.0. 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 Rating Trend test.

One-Hit Wonders

• 
• 4%
• have only posted one review

363 of the 8,406 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.2 while the reviewers who have posted more than one review 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.

Take-Back Reviewers

• 
• 15%
• have previously deleted reviews

1,276 of the 8,406 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 4.0. 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.

Single-Day Reviewers

• 
• 2%
• have posted all their reviews on a single day

151 of the 8,406 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.3 while all other reviewers rated this product an average of 4.0. 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.

• 
• 0%
• Used substantial repetitive phrases

14 of the 8,406 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.7 while reviews without substantial repetitive phrases rated this product an average of 4.0. 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.

• 
• 9%
• Substantial overlapping review history

754 of the 8,406 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.4 while the reviewers who have a more unique product review history rated this product an average of 4.0. 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.

• 191
• Reviews have been deleted

We discovered a total of 191 deleted reviews for this product, with an average rating of 4.5. 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 the Deleted Reviews test here.

Show distribution of deleted reviews

• 
• 6%
• Unverified Purchases

495 of the 8,406 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%
• 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.

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 4.1, while the average ease score for reviewers in this category is 4.2.

Brand Repeaters

• 
• 14%
• Reviewed other products from this brand

1,175 of the 8,406 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

1 of the 8,406 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, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.