• 
• 35%
• Created over 20 days

We counted 813 reviews for this product over the span of 378 days, an average of 2.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 8 or fewer reviews on any given day.

However, we see the following 20 days exceeding this threshold:

• 24 Reviews on Sep 10, 2017 (Avg. rating: 4.1)
• 23 Reviews on Sep 9, 2017 (Avg. rating: 4.4)
• 21 Reviews on Sep 13, 2017 (Avg. rating: 4.3)
• 17 Reviews on Sep 11, 2017 (Avg. rating: 4.2)
• 17 Reviews on Sep 24, 2017 (Avg. rating: 4.1)
• 16 Reviews on Sep 12, 2017 (Avg. rating: 4.5)
• 16 Reviews on Sep 14, 2017 (Avg. rating: 4.3)
• 16 Reviews on Sep 22, 2017 (Avg. rating: 3.9)
• 15 Reviews on Sep 19, 2017 (Avg. rating: 3.7)
• 13 Reviews on Sep 21, 2017 (Avg. rating: 4.3)
• 12 Reviews on Sep 18, 2017 (Avg. rating: 4.3)
• 11 Reviews on Oct 1, 2017 (Avg. rating: 4.8)
• 11 Reviews on Sep 16, 2017 (Avg. rating: 4.0)
• 11 Reviews on Sep 15, 2017 (Avg. rating: 3.6)
• 11 Reviews on Oct 4, 2017 (Avg. rating: 3.6)
• 10 Reviews on Sep 26, 2017 (Avg. rating: 4.5)
• 10 Reviews on Sep 20, 2017 (Avg. rating: 4.3)
• 10 Reviews on Nov 10, 2017 (Avg. rating: 4.2)
• 9 Reviews on Dec 18, 2017 (Avg. rating: 4.4)
• 9 Reviews on Sep 27, 2017 (Avg. rating: 4.3)
Show All

In total, we found that 282 reviews were created on just 20 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 53%
• Unverified Purchases

432 of the 813 total reviews for this product are unverified purchases. While this is a higher percentage of unverified purchases than we'd expect to see, the discrepancy in ratings between the unverified purchases and verified purchases isn't significant enough to rule out the possibility of it being due to random chance.

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.

Brand Loyalists

• 
• 2%
• Reviewed mostly products from this brand

17 of the 813 reviewers have reviewed multiple products but half or more of their reviews are for this brand. While this is more Brand Loyalists than we'd expect to see, the discrepancy in ratings between the Brand Loyalists and non-loyalists isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Brand Repeats test.

Take-Back Reviewers

• 
• 4%
• have previously deleted reviews

36 of the 813 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.

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 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

• 
• 20%
• Used substantial repetitive phrases

161 of the 813 total reviews for this product use substantial repetitive phrases between them. While this is more than we'd expect to see, the discrepancy in ratings between the these reviews and reviews without substantial repetitive phrases isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Phrase Repetition test.

• 
• 75%
• 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: 33.7% (Avg. rating: 4.2)
• Reviewers with 6-15 Reviews: 41.2% (Avg. rating: 4.3)

In total, we found that 609 reviewers (or 75%) 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.

• 
• 20%
• Substantial overlapping review history

166 of the 813 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.

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.