• 205
• Reviews have been deleted

We discovered a total of 205 deleted Reviews for this product, with an average rating of 4.2. 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

• 
• 9%
• Created over 28 days

We counted 2,099 reviews for this product over the span of 5,336 days, an average of 0.4 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.

However, we see the following 28 days exceeding this threshold:

• 14 Reviews on Nov 3, 2007 (Avg. rating: 5.0)
• 11 Reviews on Nov 8, 2016 (Avg. rating: 4.9)
• 10 Reviews on Nov 7, 2015 (Avg. rating: 5.0)
• 9 Reviews on Nov 4, 2007 (Avg. rating: 5.0)
• 9 Reviews on Jan 9, 2007 (Avg. rating: 4.8)
• 9 Reviews on Aug 3, 2006 (Avg. rating: 4.1)
• 8 Reviews on Nov 8, 2014 (Avg. rating: 5.0)
• 8 Reviews on Aug 6, 2006 (Avg. rating: 4.6)
• 8 Reviews on Aug 11, 2006 (Avg. rating: 3.5)
• 7 Reviews on Aug 7, 2006 (Avg. rating: 4.7)
• 7 Reviews on Aug 15, 2006 (Avg. rating: 4.6)
• 7 Reviews on Nov 29, 2014 (Avg. rating: 4.3)
• 7 Reviews on Aug 5, 2006 (Avg. rating: 4.0)
• 7 Reviews on Aug 4, 2006 (Avg. rating: 3.9)
• 7 Reviews on Aug 2, 2006 (Avg. rating: 3.6)
• 6 Reviews on Nov 2, 2007 (Avg. rating: 5.0)
• 6 Reviews on Dec 26, 2014 (Avg. rating: 5.0)
• 6 Reviews on Nov 9, 2006 (Avg. rating: 4.8)
• 6 Reviews on Aug 9, 2006 (Avg. rating: 4.2)
• 6 Reviews on Nov 19, 2014 (Avg. rating: 3.7)
• 5 Reviews on Nov 26, 2007 (Avg. rating: 5.0)
• 5 Reviews on Dec 6, 2014 (Avg. rating: 5.0)
• 5 Reviews on Nov 9, 2015 (Avg. rating: 5.0)
• 5 Reviews on Dec 16, 2014 (Avg. rating: 4.2)
• 5 Reviews on Nov 9, 2016 (Avg. rating: 4.2)
• 5 Reviews on Nov 10, 2014 (Avg. rating: 4.0)
• 5 Reviews on Nov 3, 2006 (Avg. rating: 3.8)
• 5 Reviews on Sep 7, 2018 (Avg. rating: 3.4)
Show All

In total, we found that 198 reviews were created on just 28 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.

Take-Back Reviewers

• 
• 41%
• have previously deleted reviews

851 of the 2,099 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.

• 
• 31%
• Unverified Purchases

652 of the 2,099 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.

• 
• 1%
• Used substantial repetitive phrases

29 of the 2,099 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.

• 
• 11%
• Substantial overlapping review history

229 of the 2,099 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.

• 
• 29%
• 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 6-15 Reviews: 29.1% (Avg. rating: 4.5)

In total, we found that 610 reviewers (or 29%) 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 4.3, while the average ease score for reviewers in this category is 4.3.

Brand Repeaters

• 
• 24%
• Reviewed other products from this brand

511 of the 2,099 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.