• 13
• Reviews have been deleted

We discovered a total of 13 deleted Reviews for this product, with an average rating of 4.5. 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

• 
• 40%
• Created over 18 days

We counted 242 reviews for this product over the span of 2,104 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 18 days exceeding this threshold:

• 26 Reviews on May 15, 2015 (Avg. rating: 4.7)
• 9 Reviews on May 16, 2015 (Avg. rating: 4.7)
• 6 Reviews on May 19, 2015 (Avg. rating: 5.0)
• 6 Reviews on May 17, 2015 (Avg. rating: 4.7)
• 5 Reviews on May 18, 2015 (Avg. rating: 4.6)
• 5 Reviews on Jun 14, 2015 (Avg. rating: 4.4)
• 4 Reviews on May 24, 2015 (Avg. rating: 4.8)
• 4 Reviews on Jun 7, 2015 (Avg. rating: 4.8)
• 4 Reviews on Jun 6, 2015 (Avg. rating: 4.3)
• 4 Reviews on Jun 2, 2015 (Avg. rating: 4.0)
• 3 Reviews on May 23, 2015 (Avg. rating: 4.7)
• 3 Reviews on May 25, 2015 (Avg. rating: 4.7)
• 3 Reviews on May 22, 2015 (Avg. rating: 4.3)
• 3 Reviews on Jun 9, 2015 (Avg. rating: 4.3)
• 3 Reviews on May 29, 2015 (Avg. rating: 4.0)
• 3 Reviews on Jun 13, 2015 (Avg. rating: 4.0)
• 3 Reviews on Jun 29, 2015 (Avg. rating: 4.0)
• 3 Reviews on May 26, 2015 (Avg. rating: 3.0)
Show All

In total, we found that 97 reviews were created on just 18 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 70%
• Unverified Purchases

169 of the 242 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.

Take-Back Reviewers

• 
• 37%
• have previously deleted reviews

90 of the 242 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.

• 
• 93%
• Used substantial repetitive phrases

226 of the 242 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.

• 
• 50%
• Substantial overlapping review history

121 of the 242 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.

• 
• 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.

• 
• 17%
• 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 51-100 Reviews: 16.9% (Avg. rating: 4.4)

In total, we found that 41 reviewers (or 17%) 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 4.4, 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.