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 4.3. 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.

• 
• 57%
• From reviewers with an overrepresented participation

We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:

• Reviewers with 1-5 Reviews: 9.7% (Avg. rating: 4.9)
• Reviewers with 51-100 Reviews: 21.2% (Avg. rating: 4.7)
• Reviewers with 101-200 Reviews: 25.7% (Avg. rating: 4.8)

In total, we found that 64 reviewers (or 57%) are within an overrepresented participation group. These reviews have rated this product an average of 4.8, while all other reviews have rated this product an average of 4.4. 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 Reviewer Participation test.

• 
• 48%
• Created over 12 days

We counted 113 reviews for this product over the span of 908 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 12 days exceeding this threshold:

• 7 Reviews on Jul 13, 2015 (Avg. rating: 4.9)
• 6 Reviews on Jul 14, 2015 (Avg. rating: 5.0)
• 6 Reviews on Jul 12, 2015 (Avg. rating: 4.8)
• 5 Reviews on Jul 16, 2015 (Avg. rating: 5.0)
• 5 Reviews on Jul 20, 2015 (Avg. rating: 4.8)
• 5 Reviews on Jul 11, 2015 (Avg. rating: 4.4)
• 4 Reviews on Jul 19, 2015 (Avg. rating: 5.0)
• 4 Reviews on Jul 15, 2015 (Avg. rating: 4.8)
• 3 Reviews on Jul 18, 2015 (Avg. rating: 4.7)
• 3 Reviews on Jul 21, 2015 (Avg. rating: 4.3)
• 3 Reviews on Jan 3, 2016 (Avg. rating: 4.3)
• 3 Reviews on Jul 25, 2015 (Avg. rating: 4.0)
Show All

In total, we found that 54 reviews were created on just 12 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

Brand Repeaters

• 
• 34%
• Reviewed other products from this brand

38 of the 113 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

• 
• 4%
• have previously deleted reviews

4 of the 113 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.

• 
• 54%
• Used substantial repetitive phrases

61 of the 113 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

Read more about our Phrase Repetition test.

• 
• 70%
• Substantial overlapping review history

79 of the 113 reviewers have substantial overlapping product review history. While this is more than we'd expect to see, the discrepancy in ratings between these reviewers and reviewers who have a more unique product review history isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Overlapping Review History test.

• 
• 34%
• Unverified Purchases

38 of the 113 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.

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.