• 
• 14%
• Created over 12 days

We counted 505 reviews for this product over the span of 1,160 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 12 days exceeding this threshold:

• 7 Reviews on Jan 5, 2020 (Avg. rating: 5.0)
• 7 Reviews on Jan 10, 2020 (Avg. rating: 5.0)
• 6 Reviews on Dec 29, 2019 (Avg. rating: 5.0)
• 6 Reviews on Jan 13, 2020 (Avg. rating: 5.0)
• 6 Reviews on Feb 27, 2020 (Avg. rating: 5.0)
• 6 Reviews on Jan 18, 2020 (Avg. rating: 4.7)
• 6 Reviews on Jan 29, 2020 (Avg. rating: 4.7)
• 6 Reviews on Feb 13, 2020 (Avg. rating: 4.7)
• 5 Reviews on Feb 26, 2020 (Avg. rating: 5.0)
• 5 Reviews on Dec 23, 2019 (Avg. rating: 4.8)
• 5 Reviews on Feb 7, 2020 (Avg. rating: 4.8)
• 5 Reviews on Dec 27, 2019 (Avg. rating: 4.4)
Show All

In total, we found that 70 reviews were created on just 12 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.

• 
• 69%
• 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: 32.1% (Avg. rating: 4.8)
• Reviewers with 6-15 Reviews: 36.6% (Avg. rating: 4.8)

In total, we found that 347 reviewers (or 69%) 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.

• 
• 2%
• Unverified Purchases

10 of the 505 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.

• 
• 6%
• Used substantial repetitive phrases

28 of the 505 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.

One-Hit Wonders

• 
• 5%
• have only posted one review

26 of the 505 reviewers have only reviewed this product. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Never-Verified Reviewers

• 
• 0%
• have zero verified purchases

1 of the 505 reviewers have never written a verified purchase review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Take-Back Reviewers

• 
• 20%
• have previously deleted reviews

102 of the 505 reviewers have had at least one of their past reviews for another product deleted. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Single-Day Reviewers

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

7 of the 505 reviewers have written multiple reviews but posted all of them on a single day. 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 Suspicious Reviewers test.

• 
• 5%
• Substantial overlapping review history

25 of the 505 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 4.4, while the average ease score for reviewers in this category is 4.3. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

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.