• 
• 63%
• Created over 15 days

We counted 252 reviews for this product over the span of 777 days, an average of 0.3 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 3 or fewer reviews on any given day.

However, we see the following 15 days exceeding this threshold:

• 29 Reviews on Aug 12, 2015 (Avg. rating: 4.8)
• 24 Reviews on Aug 13, 2015 (Avg. rating: 4.8)
• 18 Reviews on Aug 11, 2015 (Avg. rating: 4.9)
• 15 Reviews on Aug 15, 2015 (Avg. rating: 4.7)
• 9 Reviews on Aug 22, 2015 (Avg. rating: 5.0)
• 9 Reviews on Aug 14, 2015 (Avg. rating: 4.9)
• 8 Reviews on Aug 20, 2015 (Avg. rating: 5.0)
• 8 Reviews on Aug 16, 2015 (Avg. rating: 4.9)
• 7 Reviews on Aug 17, 2015 (Avg. rating: 4.3)
• 6 Reviews on Aug 28, 2015 (Avg. rating: 4.8)
• 6 Reviews on Aug 19, 2015 (Avg. rating: 4.3)
• 6 Reviews on Aug 23, 2015 (Avg. rating: 4.2)
• 5 Reviews on Aug 21, 2015 (Avg. rating: 4.8)
• 5 Reviews on Aug 18, 2015 (Avg. rating: 4.4)
• 4 Reviews on Aug 24, 2015 (Avg. rating: 4.8)
Show All

In total, we found that 159 reviews were created on just 15 days. The reviews on these high volume days have rated this product an average of 4.8 while reviews from other days have rated this product an average of 4.5. 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.

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

On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.

• 
• 10%
• Admitted to receiving an incentive

25 of the 252 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. While we could not find a statistically significant difference between the average rating of incentivized reviews and non-incentivized reviews, the presences of at least one incentivized review indicates that there may be more, since not all reviewers will disclose that they had received an incentive to post a review.

Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

Take-Back Reviewers

• 
• 3%
• have previously deleted reviews

8 of the 252 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.

• 
• 34%
• Used substantial repetitive phrases

86 of the 252 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

Read more about our Phrase Repetition test.

• 
• 70%
• From reviewers with an overrepresented participation

We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:

• Reviewers with 1-5 Reviews: 21.8% (Avg. rating: 4.8)
• Reviewers with 6-15 Reviews: 31.8% (Avg. rating: 4.6)
• Reviewers with 16-30 Reviews: 16.7% (Avg. rating: 4.7)

In total, we found that 177 reviewers (or 70%) 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.

• 
• 45%
• Unverified Purchases

114 of the 252 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.

• 
• 47%
• Substantial overlapping review history

119 of the 252 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

• 
• 8%
• Reviewed other products from this brand

21 of the 252 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.

• 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.