• 
• 20%
• Created over 19 days

We counted 370 reviews for this product over the span of 3,261 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.

However, we see the following 19 days exceeding this threshold:

• 6 Reviews on May 21, 2020 (Avg. rating: 4.3)
• 5 Reviews on May 13, 2020 (Avg. rating: 5.0)
• 5 Reviews on May 18, 2020 (Avg. rating: 4.8)
• 5 Reviews on Apr 24, 2020 (Avg. rating: 4.4)
• 5 Reviews on May 14, 2020 (Avg. rating: 3.4)
• 4 Reviews on May 5, 2020 (Avg. rating: 4.5)
• 4 Reviews on Apr 30, 2020 (Avg. rating: 4.0)
• 4 Reviews on May 6, 2020 (Avg. rating: 4.0)
• 4 Reviews on May 9, 2020 (Avg. rating: 4.0)
• 4 Reviews on May 20, 2020 (Avg. rating: 3.0)
• 3 Reviews on Apr 13, 2020 (Avg. rating: 5.0)
• 3 Reviews on Apr 26, 2020 (Avg. rating: 5.0)
• 3 Reviews on May 1, 2020 (Avg. rating: 5.0)
• 3 Reviews on May 2, 2020 (Avg. rating: 5.0)
• 3 Reviews on Apr 14, 2020 (Avg. rating: 4.7)
• 3 Reviews on Apr 27, 2020 (Avg. rating: 4.7)
• 3 Reviews on May 15, 2020 (Avg. rating: 4.7)
• 3 Reviews on Sep 11, 2018 (Avg. rating: 3.7)
• 3 Reviews on May 12, 2020 (Avg. rating: 3.7)
Show All

In total, we found that 73 reviews were created on just 19 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 2%
• Unverified Purchases

9 of the 370 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.

• 
• 4%
• Used substantial repetitive phrases

13 of the 370 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

• 
• 3%
• have only posted one review

11 of the 370 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

We didn't detect a substantial amount of Never-Verified Reviewers.

Take-Back Reviewers

• 
• 17%
• have previously deleted reviews

63 of the 370 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

3 of the 370 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.

• 
• 12%
• Substantial overlapping review history

43 of the 370 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.

• 
• 20%
• 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 16-30 Reviews: 20.3% (Avg. rating: 4.7)

In total, we found that 75 reviewers (or 20%) 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 4.5, 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

• 
• 0%
• Reviewed other products from this brand

1 of the 370 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.