Take-Back Reviewers

• 
• 44%
• have previously deleted reviews

751 of the 1,724 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 4.2 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 3.9. 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.

Single-Day Reviewers

• 
• 2%
• have posted all their reviews on a single day

31 of the 1,724 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 4.6 while all other reviewers rated this product an average of 4.0. 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.

• 
• 33%
• Have an overrepresented word count

In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 1 group with a statistically significant greater concentration than what we'd expect to see:

• 6-15 words: 33.4% (Avg. rating: 4.3)

In total, we found that 575 reviews (or 33%) are within an overrepresented word count group. These reviews have rated this product an average of 4.3, while all other reviews have rated this product an average of 3.9. 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 Word Count Comparison test.

• 
• 12%
• Used substantial repetitive phrases

206 of the 1,724 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.4 while reviews without substantial repetitive phrases rated this product an average of 4.0. 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.

• 
• 20%
• Substantial overlapping review history

337 of the 1,724 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.4 while the reviewers who have a more unique product review history rated this product an average of 3.9. 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.

• 4
• Reviews have been deleted

We discovered a total of 4 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 the Deleted Reviews test here.

Show distribution of deleted reviews

• 
• 15%
• Created over 39 days

We counted 1,724 reviews for this product over the span of 2,047 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 39 days exceeding this threshold:

• 8 reviews on May 29, 2015 (Avg. rating: 3.9)
• 8 reviews on Apr 22, 2015 (Avg. rating: 3.1)
• 8 reviews on Aug 13, 2015 (Avg. rating: 3.0)
• 7 reviews on Sep 8, 2015 (Avg. rating: 4.9)
• 7 reviews on Aug 20, 2015 (Avg. rating: 4.4)
• 7 reviews on Oct 10, 2015 (Avg. rating: 4.3)
• 7 reviews on Aug 30, 2015 (Avg. rating: 4.3)
• 7 reviews on Oct 5, 2015 (Avg. rating: 3.7)
• 7 reviews on Mar 4, 2015 (Avg. rating: 3.7)
• 7 reviews on Sep 2, 2015 (Avg. rating: 3.7)
• 7 reviews on Apr 29, 2015 (Avg. rating: 3.7)
• 7 reviews on Dec 30, 2014 (Avg. rating: 3.6)
• 7 reviews on Mar 25, 2015 (Avg. rating: 3.6)
• 7 reviews on Jul 27, 2015 (Avg. rating: 3.1)
• 7 reviews on Nov 2, 2015 (Avg. rating: 3.0)
• 6 reviews on Aug 31, 2015 (Avg. rating: 5.0)
• 6 reviews on Apr 8, 2015 (Avg. rating: 4.7)
• 6 reviews on Sep 18, 2015 (Avg. rating: 4.7)
• 6 reviews on Feb 23, 2015 (Avg. rating: 4.7)
• 6 reviews on Jun 4, 2015 (Avg. rating: 4.5)
• 6 reviews on Jul 13, 2015 (Avg. rating: 4.5)
• 6 reviews on Aug 23, 2015 (Avg. rating: 4.5)
• 6 reviews on Dec 9, 2014 (Avg. rating: 4.5)
• 6 reviews on Mar 6, 2015 (Avg. rating: 4.3)
• 6 reviews on Jul 25, 2015 (Avg. rating: 4.2)
• 6 reviews on Apr 3, 2015 (Avg. rating: 4.2)
• 6 reviews on Mar 31, 2015 (Avg. rating: 4.0)
• 6 reviews on Aug 9, 2015 (Avg. rating: 3.8)
• 6 reviews on Jul 29, 2015 (Avg. rating: 3.8)
• 6 reviews on May 30, 2015 (Avg. rating: 3.8)
• 6 reviews on Mar 27, 2015 (Avg. rating: 3.8)
• 6 reviews on Feb 24, 2015 (Avg. rating: 3.8)
• 6 reviews on Dec 28, 2015 (Avg. rating: 3.8)
• 6 reviews on Aug 16, 2015 (Avg. rating: 3.7)
• 6 reviews on Feb 22, 2015 (Avg. rating: 3.7)
• 6 reviews on Feb 9, 2015 (Avg. rating: 3.7)
• 6 reviews on Aug 7, 2015 (Avg. rating: 3.5)
• 6 reviews on Dec 1, 2015 (Avg. rating: 3.2)
• 6 reviews on Oct 6, 2015 (Avg. rating: 2.7)
Show All

In total, we found that 252 reviews were created on just 39 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.

Read more about our Rating Trend test.

• 
• 61%
• 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: 12.6% (Avg. rating: 3.5)
• Reviewers with 6-15 reviews: 28.5% (Avg. rating: 3.8)
• Reviewers with 16-30 reviews: 19.6% (Avg. rating: 4.0)

In total, we found that 1045 reviewers (or 61%) 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.

• 
• 7%
• Unverified Purchases

119 of the 1,724 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.

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 4.3, while the average ease score for reviewers in this category is 4.4.

Brand Repeaters

• 
• 2%
• Reviewed other products from this brand

42 of the 1,724 reviewers have reviewed other products for this brand. 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 Brand Repeats 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

1 of the 1,724 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, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.