• 
• 10%
• Created over 36 days

We counted 5,208 reviews for this product over the span of 1,432 days, an average of 3.6 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 36 days exceeding this threshold:

• 30 Reviews on Jan 11, 2018 (Avg. rating: 4.5)
• 29 Reviews on Jan 10, 2018 (Avg. rating: 4.4)
• 19 Reviews on Aug 21, 2018 (Avg. rating: 4.3)
• 19 Reviews on Jan 3, 2020 (Avg. rating: 3.7)
• 17 Reviews on Jan 9, 2018 (Avg. rating: 4.4)
• 17 Reviews on Dec 27, 2019 (Avg. rating: 4.3)
• 16 Reviews on Dec 12, 2019 (Avg. rating: 4.6)
• 16 Reviews on Mar 19, 2018 (Avg. rating: 4.3)
• 15 Reviews on Feb 20, 2018 (Avg. rating: 4.3)
• 14 Reviews on Aug 23, 2018 (Avg. rating: 4.6)
• 14 Reviews on Sep 7, 2018 (Avg. rating: 4.5)
• 14 Reviews on Jan 8, 2019 (Avg. rating: 4.4)
• 14 Reviews on Jan 3, 2019 (Avg. rating: 3.9)
• 14 Reviews on Jan 11, 2020 (Avg. rating: 3.6)
• 13 Reviews on Dec 29, 2019 (Avg. rating: 4.8)
• 13 Reviews on Sep 29, 2018 (Avg. rating: 4.6)
• 13 Reviews on Jul 17, 2019 (Avg. rating: 4.5)
• 13 Reviews on Aug 22, 2018 (Avg. rating: 4.3)
• 13 Reviews on Aug 8, 2018 (Avg. rating: 4.3)
• 13 Reviews on Oct 9, 2019 (Avg. rating: 4.3)
• 13 Reviews on Feb 21, 2018 (Avg. rating: 4.3)
• 13 Reviews on Sep 10, 2018 (Avg. rating: 4.2)
• 13 Reviews on Dec 22, 2019 (Avg. rating: 4.2)
• 13 Reviews on Aug 2, 2018 (Avg. rating: 4.2)
• 13 Reviews on Dec 10, 2018 (Avg. rating: 4.0)
• 13 Reviews on Sep 6, 2018 (Avg. rating: 3.8)
• 13 Reviews on Apr 1, 2018 (Avg. rating: 3.7)
• 13 Reviews on Dec 19, 2019 (Avg. rating: 3.4)
• 12 Reviews on Aug 29, 2018 (Avg. rating: 4.8)
• 12 Reviews on Jul 1, 2019 (Avg. rating: 4.7)
• 12 Reviews on Jun 12, 2018 (Avg. rating: 4.6)
• 12 Reviews on Dec 30, 2019 (Avg. rating: 4.6)
• 12 Reviews on Jan 22, 2019 (Avg. rating: 4.4)
• 12 Reviews on Jul 24, 2019 (Avg. rating: 4.3)
• 12 Reviews on Aug 24, 2018 (Avg. rating: 4.2)
• 12 Reviews on May 13, 2019 (Avg. rating: 4.1)
Show All

In total, we found that 526 reviews were created on just 36 days. The reviews on these high volume days have rated this product an average of 4.3 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.

• 
• 15%
• Unverified Purchases

796 of the 5,208 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 2.7 while the verified purchasers 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.

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.

One-Hit Wonders

• 
• 4%
• have only posted one review

190 of the 5,208 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.3 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.

Never-Verified Reviewers

• 
• 2%
• have zero verified purchases

119 of the 5,208 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 2.5 while the reviewers who have written at least one verified purchase review 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

• 
• 35%
• have previously deleted reviews

1,838 of the 5,208 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 4.2 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

• 
• 1%
• have posted all their reviews on a single day

62 of the 5,208 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 4.4 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.

• 
• 22%
• Substantial overlapping review history

1,163 of the 5,208 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 3.9. 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.

• 
• 54%
• 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: 20.5% (Avg. rating: 3.7)
• Reviewers with 6-15 Reviews: 33.2% (Avg. rating: 4.0)

In total, we found that 2797 reviewers (or 54%) 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.

• 
• 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%
• Used substantial repetitive phrases

0 of the 5,208 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.

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 4.3.

Brand Repeaters

• 
• 6%
• Reviewed other products from this brand

310 of the 5,208 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.