• 
• 15%
• Created over 27 days

We counted 1,290 reviews for this product over the span of 1,635 days, an average of 0.8 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 5 or fewer reviews on any given day.

However, we see the following 27 days exceeding this threshold:

• 11 Reviews on Jul 10, 2017 (Avg. rating: 4.7)
• 10 Reviews on Nov 21, 2016 (Avg. rating: 4.7)
• 9 Reviews on Jul 24, 2017 (Avg. rating: 4.7)
• 9 Reviews on Jul 18, 2017 (Avg. rating: 4.6)
• 9 Reviews on Jul 23, 2017 (Avg. rating: 4.6)
• 8 Reviews on Jul 16, 2017 (Avg. rating: 4.9)
• 8 Reviews on Jul 19, 2017 (Avg. rating: 4.6)
• 7 Reviews on Jul 9, 2017 (Avg. rating: 5.0)
• 7 Reviews on Nov 16, 2016 (Avg. rating: 4.9)
• 7 Reviews on Nov 15, 2016 (Avg. rating: 4.6)
• 7 Reviews on Nov 18, 2016 (Avg. rating: 4.6)
• 7 Reviews on Jul 7, 2017 (Avg. rating: 4.3)
• 6 Reviews on Nov 10, 2016 (Avg. rating: 5.0)
• 6 Reviews on Jul 15, 2017 (Avg. rating: 5.0)
• 6 Reviews on Jul 17, 2017 (Avg. rating: 5.0)
• 6 Reviews on Nov 20, 2016 (Avg. rating: 4.8)
• 6 Reviews on Dec 11, 2019 (Avg. rating: 4.8)
• 6 Reviews on Jan 2, 2021 (Avg. rating: 4.7)
• 6 Reviews on Nov 19, 2016 (Avg. rating: 4.5)
• 6 Reviews on Jul 20, 2017 (Avg. rating: 4.5)
• 6 Reviews on Nov 17, 2016 (Avg. rating: 4.3)
• 6 Reviews on Nov 22, 2016 (Avg. rating: 4.3)
• 6 Reviews on Jul 21, 2017 (Avg. rating: 4.3)
• 6 Reviews on Jul 26, 2017 (Avg. rating: 4.3)
• 6 Reviews on Dec 29, 2020 (Avg. rating: 4.2)
• 6 Reviews on Jul 13, 2017 (Avg. rating: 4.0)
• 6 Reviews on Dec 17, 2019 (Avg. rating: 3.7)
Show All

In total, we found that 189 reviews were created on just 27 days. The reviews on these high volume days have rated this product an average of 4.6 while reviews from other days 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 Rating Trend test.

One-Hit Wonders

• 
• 6%
• have only posted one review

71 of the 1,290 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.5 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

• 
• 53%
• have previously deleted reviews

685 of the 1,290 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 4.4 while the reviewers who don't have any deleted reviews in their history have 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 Suspicious Reviewers test.

• 
• 6%
• Used substantial repetitive phrases

81 of the 1,290 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.6 while reviews without substantial repetitive phrases 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 Phrase Repetition test.

• 
• 21%
• Substantial overlapping review history

273 of the 1,290 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.5 while the reviewers who have a more unique product review history 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 Overlapping Review History test.

• 
• 2%
• Unverified Purchases

31 of the 1,290 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.

• 
• 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.

• 
• 19%
• 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: 19.5% (Avg. rating: 4.0)

In total, we found that 251 reviewers (or 19%) are within an overrepresented participation 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 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 4.3, while the average ease score for reviewers in this category is 4.3.

Brand Repeaters

• 
• 18%
• Reviewed other products from this brand

227 of the 1,290 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

2 of the 1,290 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. 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.