• 97
• Reviews have been deleted

We discovered a total of 97 deleted Reviews for this product, with an average rating of 4.5. 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

• 
• 86%
• Created over 38 days

We counted 1,022 reviews for this product over the span of 1,558 days, an average of 0.7 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 38 days exceeding this threshold:

• 86 Reviews on Jan 5, 2015 (Avg. rating: 4.5)
• 78 Reviews on Jan 16, 2015 (Avg. rating: 4.5)
• 51 Reviews on Jan 6, 2015 (Avg. rating: 4.5)
• 34 Reviews on Jan 17, 2015 (Avg. rating: 4.4)
• 31 Reviews on Dec 29, 2014 (Avg. rating: 4.7)
• 30 Reviews on Dec 15, 2014 (Avg. rating: 4.7)
• 30 Reviews on Jan 8, 2015 (Avg. rating: 4.6)
• 27 Reviews on Jan 15, 2015 (Avg. rating: 4.6)
• 27 Reviews on Jan 2, 2015 (Avg. rating: 4.3)
• 25 Reviews on Jan 7, 2015 (Avg. rating: 4.5)
• 25 Reviews on Jan 18, 2015 (Avg. rating: 4.3)
• 24 Reviews on Dec 13, 2014 (Avg. rating: 4.5)
• 24 Reviews on Jan 1, 2015 (Avg. rating: 4.4)
• 23 Reviews on Dec 14, 2014 (Avg. rating: 4.6)
• 22 Reviews on Dec 28, 2014 (Avg. rating: 4.7)
• 22 Reviews on Jan 13, 2015 (Avg. rating: 4.6)
• 22 Reviews on Jan 3, 2015 (Avg. rating: 4.6)
• 21 Reviews on Jan 12, 2015 (Avg. rating: 4.8)
• 21 Reviews on Jan 4, 2015 (Avg. rating: 4.1)
• 20 Reviews on Dec 21, 2014 (Avg. rating: 4.6)
• 20 Reviews on Dec 22, 2014 (Avg. rating: 4.6)
• 20 Reviews on Dec 30, 2014 (Avg. rating: 4.6)
• 19 Reviews on Dec 11, 2014 (Avg. rating: 4.7)
• 19 Reviews on Dec 17, 2014 (Avg. rating: 4.5)
• 18 Reviews on Dec 19, 2014 (Avg. rating: 4.4)
• 17 Reviews on Dec 25, 2014 (Avg. rating: 4.2)
• 13 Reviews on Dec 26, 2014 (Avg. rating: 4.5)
• 13 Reviews on Dec 16, 2014 (Avg. rating: 4.5)
• 13 Reviews on Dec 18, 2014 (Avg. rating: 4.2)
• 12 Reviews on Dec 20, 2014 (Avg. rating: 4.4)
• 11 Reviews on Dec 23, 2014 (Avg. rating: 4.4)
• 11 Reviews on Jan 14, 2015 (Avg. rating: 3.8)
• 10 Reviews on Dec 27, 2014 (Avg. rating: 4.8)
• 10 Reviews on Dec 12, 2014 (Avg. rating: 4.3)
• 9 Reviews on Jan 9, 2015 (Avg. rating: 4.8)
• 9 Reviews on Jan 10, 2015 (Avg. rating: 4.3)
• 8 Reviews on Jan 11, 2015 (Avg. rating: 4.4)
• 7 Reviews on Dec 31, 2014 (Avg. rating: 4.3)
Show All

In total, we found that 882 reviews were created on just 38 days. The reviews on these high volume days have rated this product an average of 4.5 while reviews from other days have 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 Rating Trend test.

• 
• 88%
• Unverified Purchases

895 of the 1,022 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.5 while the verified purchasers have 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.

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 Repeaters

• 
• 85%
• Reviewed other products from this brand

864 of the 1,022 reviewers have reviewed other products for this brand. This is an excessively large percentage of Brand Repeaters which may indicate unnatural reviews.

Brand Loyalists

• 
• 33%
• Reviewed mostly products from this brand

333 of the 1,022 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.

Brand Monogamists

• 
• 9%
• Reviewed only products from this brand

95 of the 1,022 reviewers have reviewed multiple products, but only for this brand. This is an excessively large percentage of Brand Monogamists which may indicate unnatural reviews.

Read more about our Brand Repeats test.

Never-Verified Reviewers

• 
• 35%
• have zero verified purchases

361 of the 1,022 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

• 
• 21%
• have previously deleted reviews

217 of the 1,022 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

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

• 
• 37%
• Used substantial repetitive phrases

380 of the 1,022 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

Read more about our Phrase Repetition test.

• 
• 69%
• 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: 33.8% (Avg. rating: 4.5)
• Reviewers with 6-15 Reviews: 35.4% (Avg. rating: 4.5)

In total, we found that 707 reviewers (or 69%) 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.

• 
• 9%
• Substantial overlapping review history

92 of the 1,022 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.

On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.

• 
• 1%
• Admitted to receiving an incentive

8 of the 1,022 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. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.