• 
• 5%
• Unverified Purchases

18 of the 342 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.9 while the verified purchasers 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.

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

• 
• 6%
• Reviewed mostly products from this brand

19 of the 342 reviewers have reviewed multiple products but half or more of their reviews are for this brand. This is an excessively large percentage of Brand Loyalists which may indicate unnatural reviews.

Read more about our Brand Repeats test.

One-Hit Wonders

• 
• 4%
• have only posted one review

14 of the 342 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.7 while the reviewers who have posted more than one review 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.

Take-Back Reviewers

• 
• 44%
• have previously deleted reviews

152 of the 342 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.7 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 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.

Read more about our Suspicious Reviewers test.

• 
• 6%
• Used substantial repetitive phrases

21 of the 342 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.9 while reviews without substantial repetitive phrases 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 Phrase Repetition test.

• 
• 17%
• Substantial overlapping review history

57 of the 342 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.9 while the reviewers who have a more unique product review history rated this product an average of 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.

Read more about our Overlapping Review History test.

• 7
• Reviews have been deleted

We discovered a total of 7 deleted Reviews 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

• 
• 18%
• Created over 14 days

We counted 342 reviews for this product over the span of 1,056 days, an average of 0.3 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 3 or fewer reviews on any given day.

However, we see the following 14 days exceeding this threshold:

• 6 Reviews on Oct 26, 2017 (Avg. rating: 4.8)
• 6 Reviews on Jan 10, 2018 (Avg. rating: 4.3)
• 5 Reviews on Sep 25, 2017 (Avg. rating: 4.8)
• 5 Reviews on Jan 4, 2018 (Avg. rating: 4.4)
• 4 Reviews on Sep 27, 2017 (Avg. rating: 5.0)
• 4 Reviews on Oct 15, 2017 (Avg. rating: 5.0)
• 4 Reviews on Oct 16, 2017 (Avg. rating: 5.0)
• 4 Reviews on Dec 5, 2017 (Avg. rating: 5.0)
• 4 Reviews on Nov 29, 2017 (Avg. rating: 4.8)
• 4 Reviews on Oct 14, 2017 (Avg. rating: 4.5)
• 4 Reviews on Nov 23, 2017 (Avg. rating: 4.3)
• 4 Reviews on Oct 13, 2017 (Avg. rating: 4.0)
• 4 Reviews on Jan 12, 2018 (Avg. rating: 4.0)
• 4 Reviews on Dec 1, 2017 (Avg. rating: 3.8)
Show All

In total, we found that 62 reviews were created on just 14 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 71%
• 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: 31.0% (Avg. rating: 4.2)
• Reviewers with 6-15 Reviews: 40.1% (Avg. rating: 4.5)

In total, we found that 243 reviewers (or 71%) 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.

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

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.