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 4.6, while the average ease score for reviewers in this category is 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.

• 27
• Reviews have been deleted

We discovered a total of 27 deleted Reviews for this product, with an average rating of 4.9. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.

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.

Show distribution of deleted reviews

• 
• 56%
• Created over 20 days

We counted 945 reviews for this product over the span of 767 days, an average of 1.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 6 or fewer reviews on any given day.

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

• 76 Reviews on May 7, 2018 (Avg. rating: 4.9)
• 64 Reviews on May 8, 2018 (Avg. rating: 5.0)
• 64 Reviews on May 10, 2018 (Avg. rating: 4.8)
• 56 Reviews on May 9, 2018 (Avg. rating: 4.9)
• 33 Reviews on May 16, 2018 (Avg. rating: 4.8)
• 33 Reviews on May 15, 2018 (Avg. rating: 4.8)
• 33 Reviews on May 14, 2018 (Avg. rating: 4.6)
• 31 Reviews on May 11, 2018 (Avg. rating: 5.0)
• 25 Reviews on May 12, 2018 (Avg. rating: 4.8)
• 20 Reviews on May 17, 2018 (Avg. rating: 4.7)
• 17 Reviews on May 13, 2018 (Avg. rating: 4.9)
• 10 Reviews on May 28, 2018 (Avg. rating: 5.0)
• 9 Reviews on May 20, 2018 (Avg. rating: 4.9)
• 9 Reviews on May 19, 2018 (Avg. rating: 4.8)
• 9 Reviews on May 25, 2018 (Avg. rating: 4.7)
• 8 Reviews on Jun 5, 2018 (Avg. rating: 4.9)
• 7 Reviews on May 18, 2018 (Avg. rating: 5.0)
• 7 Reviews on Jan 31, 2019 (Avg. rating: 5.0)
• 7 Reviews on May 22, 2018 (Avg. rating: 4.9)
• 7 Reviews on Jun 14, 2018 (Avg. rating: 4.9)
Show All

In total, we found that 525 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.

• 
• 76%
• Unverified Purchases

719 of the 945 total reviews for this product are unverified purchases. While this is a higher percentage of unverified purchases than we'd expect to see, it does not appear to have a significant impact on the overall rating.

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 Repeaters

• 
• 60%
• Reviewed other products from this brand

568 of the 945 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Read more about our Brand Repeats test.

Take-Back Reviewers

• 
• 26%
• have previously deleted reviews

242 of the 945 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.

• 
• 53%
• Substantial overlapping review history

505 of the 945 reviewers have substantial overlapping product review history. While this is more than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Read more about our Overlapping Review History test.

• 
• 44%
• 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 6-15 Reviews: 23.5% (Avg. rating: 4.9)
• Reviewers with 16-30 Reviews: 20.7% (Avg. rating: 4.9)

In total, we found that 418 reviewers (or 44%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, the discrepancy in ratings between reviewers in an overrepresented participation groups and all other reviewers isn’t significant enough to rule out the possibility of it being due to random chance.

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.

• 
• 13%
• Used substantial repetitive phrases

122 of the 945 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.

On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.

• 
• 2%
• Admitted to receiving an incentive

19 of the 945 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.