One-Hit Wonders

• 
• 14%
• have only posted one review

64 of the 465 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Never-Verified Reviewers

• 
• 21%
• have zero verified purchases

96 of the 465 reviewers have never written a verified purchase review. While this is more Never-Verified Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Take-Back Reviewers

• 
• 0%
• have previously deleted reviews

1 of the 465 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, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.

Single-Day Reviewers

• 
• 3%
• have posted all their reviews on a single day

13 of the 465 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.3 while all other reviewers rated this product an average of 3.6. 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 Suspicious Reviewers test.

• 
• 55%
• Used substantial repetitive phrases

257 of the 465 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 3.8 while reviews without substantial repetitive phrases rated this product an average of 3.5. 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 Phrase Repetition test.

• 1
• Review has been deleted

We discovered a total of 1 deleted Review for this product, with an average rating of 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

• 
• 46%
• Created over 25 days

We counted 465 reviews for this product over the span of 562 days, an average of 0.8 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 5 or fewer reviews on any given day.

However, we see the following 25 days exceeding this threshold:

• 13 Reviews on Nov 5, 2016 (Avg. rating: 4.4)
• 12 Reviews on Nov 2, 2016 (Avg. rating: 4.3)
• 12 Reviews on Oct 15, 2016 (Avg. rating: 3.7)
• 12 Reviews on Oct 16, 2016 (Avg. rating: 3.6)
• 11 Reviews on Nov 3, 2016 (Avg. rating: 4.2)
• 11 Reviews on Oct 30, 2016 (Avg. rating: 3.8)
• 10 Reviews on Nov 8, 2016 (Avg. rating: 4.4)
• 10 Reviews on Nov 1, 2016 (Avg. rating: 3.5)
• 10 Reviews on Oct 31, 2016 (Avg. rating: 3.1)
• 9 Reviews on Nov 4, 2016 (Avg. rating: 4.1)
• 9 Reviews on Oct 17, 2016 (Avg. rating: 3.2)
• 8 Reviews on Oct 14, 2016 (Avg. rating: 4.3)
• 8 Reviews on Nov 15, 2016 (Avg. rating: 4.0)
• 8 Reviews on Nov 9, 2016 (Avg. rating: 2.5)
• 7 Reviews on Dec 12, 2016 (Avg. rating: 4.0)
• 7 Reviews on Oct 21, 2016 (Avg. rating: 3.7)
• 7 Reviews on Oct 18, 2016 (Avg. rating: 3.0)
• 7 Reviews on Oct 19, 2016 (Avg. rating: 2.6)
• 6 Reviews on Nov 21, 2016 (Avg. rating: 4.7)
• 6 Reviews on Oct 24, 2016 (Avg. rating: 4.3)
• 6 Reviews on Nov 6, 2016 (Avg. rating: 4.3)
• 6 Reviews on Oct 28, 2016 (Avg. rating: 3.5)
• 6 Reviews on Oct 20, 2016 (Avg. rating: 3.0)
• 6 Reviews on Nov 19, 2016 (Avg. rating: 2.8)
• 6 Reviews on Oct 22, 2016 (Avg. rating: 2.7)
Show All

In total, we found that 213 reviews were created on just 25 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 28%
• Unverified Purchases

128 of the 465 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.

• 
• 2%
• Substantial overlapping review history

11 of the 465 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.

• 
• 0%
• From reviewers with an overrepresented participation

We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
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 3.7, while the average ease score for reviewers in this category is 4.

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.