• 10
• Reviews have been deleted

We discovered a total of 10 deleted Reviews for this product, with an average rating of 4.9. 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

Take-Back Reviewers

• 
• 83%
• have previously deleted reviews

147 of the 178 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 4.3 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 3.7. 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.

• 
• 63%
• Created over 14 days

We counted 178 reviews for this product over the span of 780 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 14 days exceeding this threshold:

• 17 Reviews on Mar 25, 2016 (Avg. rating: 4.4)
• 12 Reviews on Mar 22, 2016 (Avg. rating: 4.3)
• 11 Reviews on Mar 23, 2016 (Avg. rating: 4.3)
• 9 Reviews on Mar 24, 2016 (Avg. rating: 4.0)
• 8 Reviews on Mar 26, 2016 (Avg. rating: 4.5)
• 8 Reviews on Mar 21, 2016 (Avg. rating: 4.1)
• 8 Reviews on Mar 17, 2016 (Avg. rating: 4.0)
• 7 Reviews on Mar 30, 2016 (Avg. rating: 4.4)
• 7 Reviews on Mar 18, 2016 (Avg. rating: 4.0)
• 6 Reviews on Mar 16, 2016 (Avg. rating: 4.0)
• 5 Reviews on Mar 31, 2016 (Avg. rating: 4.4)
• 5 Reviews on Mar 27, 2016 (Avg. rating: 4.0)
• 5 Reviews on Mar 28, 2016 (Avg. rating: 3.6)
• 4 Reviews on Mar 19, 2016 (Avg. rating: 4.3)
Show All

In total, we found that 112 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.

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

• 
• 63%
• Admitted to receiving an incentive

112 of the 178 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. This is an excessively large percentage of incentivized reviews which may indicate unnatural reviews.

Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

Brand Repeaters

• 
• 37%
• Reviewed other products from this brand

66 of the 178 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Read more about our Brand Repeats test.

• 
• 44%
• Used substantial repetitive phrases

78 of the 178 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.

• 
• 2%
• Unverified Purchases

4 of the 178 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.

• 
• 24%
• 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:

• 101-200 words: 24.2% (Avg. rating: 4.3)

In total, we found that 43 reviews (or 24%) are within an overrepresented word count 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 Word Count Comparison test.

• 
• 47%
• Substantial overlapping review history

84 of the 178 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.

• 
• 0%
• From reviewers with an overrepresented participation

We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
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 4.4, while the average ease score for reviewers in this category is 4.4.