• 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

• 
• 38%
• Created over 62 days

We counted 1,239 reviews for this product over the span of 6,539 days, an average of 0.2 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 62 days exceeding this threshold:

• 28 Reviews on Jan 23, 2016 (Avg. rating: 4.8)
• 27 Reviews on Feb 16, 2016 (Avg. rating: 4.9)
• 22 Reviews on Feb 27, 2016 (Avg. rating: 4.8)
• 19 Reviews on Mar 29, 2016 (Avg. rating: 4.8)
• 19 Reviews on Feb 28, 2016 (Avg. rating: 4.7)
• 19 Reviews on Mar 6, 2016 (Avg. rating: 4.4)
• 16 Reviews on Mar 15, 2016 (Avg. rating: 4.9)
• 15 Reviews on Apr 19, 2016 (Avg. rating: 4.9)
• 13 Reviews on Jan 31, 2016 (Avg. rating: 4.9)
• 12 Reviews on May 5, 2016 (Avg. rating: 4.9)
• 11 Reviews on Oct 31, 2015 (Avg. rating: 5.0)
• 10 Reviews on Feb 20, 2015 (Avg. rating: 4.9)
• 9 Reviews on Feb 9, 2016 (Avg. rating: 4.8)
• 8 Reviews on Aug 14, 2015 (Avg. rating: 5.0)
• 8 Reviews on Oct 7, 2015 (Avg. rating: 5.0)
• 8 Reviews on Jul 13, 2015 (Avg. rating: 4.9)
• 8 Reviews on Oct 23, 2015 (Avg. rating: 4.9)
• 8 Reviews on Apr 27, 2016 (Avg. rating: 4.8)
• 8 Reviews on Mar 7, 2016 (Avg. rating: 4.6)
• 7 Reviews on Oct 15, 2015 (Avg. rating: 5.0)
• 7 Reviews on Feb 28, 2015 (Avg. rating: 4.9)
• 6 Reviews on Feb 3, 2016 (Avg. rating: 5.0)
• 6 Reviews on Dec 3, 2015 (Avg. rating: 5.0)
• 6 Reviews on Feb 17, 2016 (Avg. rating: 4.8)
• 6 Reviews on Aug 8, 2015 (Avg. rating: 4.5)
• 5 Reviews on Jul 21, 2015 (Avg. rating: 5.0)
• 5 Reviews on Jul 30, 2015 (Avg. rating: 5.0)
• 5 Reviews on Mar 10, 2016 (Avg. rating: 5.0)
• 5 Reviews on Apr 20, 2015 (Avg. rating: 5.0)
• 5 Reviews on Nov 8, 2015 (Avg. rating: 5.0)
• 5 Reviews on Feb 1, 2016 (Avg. rating: 5.0)
• 5 Reviews on Feb 4, 2016 (Avg. rating: 5.0)
• 5 Reviews on Mar 16, 2016 (Avg. rating: 4.8)
• 5 Reviews on Jun 8, 2015 (Avg. rating: 4.8)
• 5 Reviews on Sep 25, 2015 (Avg. rating: 4.8)
• 5 Reviews on Apr 20, 2016 (Avg. rating: 4.8)
• 5 Reviews on May 1, 2016 (Avg. rating: 4.8)
• 5 Reviews on Sep 16, 2015 (Avg. rating: 4.6)
• 5 Reviews on Apr 2, 2014 (Avg. rating: 4.6)
• 4 Reviews on Feb 10, 2013 (Avg. rating: 5.0)
• 4 Reviews on Dec 2, 2015 (Avg. rating: 5.0)
• 4 Reviews on Nov 1, 2015 (Avg. rating: 5.0)
• 4 Reviews on Mar 3, 2016 (Avg. rating: 5.0)
• 4 Reviews on Sep 7, 2015 (Avg. rating: 5.0)
• 4 Reviews on Aug 9, 2015 (Avg. rating: 5.0)
• 4 Reviews on Mar 17, 2016 (Avg. rating: 5.0)
• 4 Reviews on Mar 1, 2015 (Avg. rating: 5.0)
• 4 Reviews on May 21, 2016 (Avg. rating: 5.0)
• 4 Reviews on Jun 9, 2016 (Avg. rating: 5.0)
• 4 Reviews on Jan 30, 2016 (Avg. rating: 4.8)
• 4 Reviews on Jun 26, 2015 (Avg. rating: 4.8)
• 4 Reviews on Jun 16, 2015 (Avg. rating: 4.8)
• 4 Reviews on May 4, 2015 (Avg. rating: 4.8)
• 4 Reviews on Apr 29, 2015 (Avg. rating: 4.8)
• 4 Reviews on Apr 11, 2015 (Avg. rating: 4.8)
• 4 Reviews on Mar 18, 2015 (Avg. rating: 4.8)
• 4 Reviews on May 13, 2016 (Avg. rating: 4.8)
• 4 Reviews on Mar 2, 2016 (Avg. rating: 4.5)
• 4 Reviews on Aug 27, 2015 (Avg. rating: 4.5)
• 4 Reviews on Mar 18, 2016 (Avg. rating: 4.5)
• 4 Reviews on May 30, 2015 (Avg. rating: 4.5)
• 4 Reviews on Jun 18, 2016 (Avg. rating: 4.5)
Show All

In total, we found that 468 reviews were created on just 62 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

Take-Back Reviewers

• 
• 10%
• have previously deleted reviews

122 of the 1,239 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.

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 4.5, 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.

• 
• 52%
• 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: 24.0% (Avg. rating: 4.8)
• Reviewers with 6-15 Reviews: 28.5% (Avg. rating: 4.8)

In total, we found that 650 reviewers (or 53%) 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.

• 
• 29%
• Unverified Purchases

357 of the 1,239 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%
• Used substantial repetitive phrases

23 of the 1,239 total reviews for this product use substantial repetitive phrases between them. 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 Phrase Repetition test.

• 
• 45%
• Substantial overlapping review history

563 of the 1,239 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.

Brand Repeaters

• 
• 8%
• Reviewed other products from this brand

96 of the 1,239 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

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.