Take-Back Reviewers

• 
• 11%
• have previously deleted reviews

31 of the 273 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 4.5, 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.

• 2
• Reviews have been deleted

We discovered a total of 2 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 our Deleted Reviews test.

Show distribution of deleted reviews

• 
• 47%
• Created over 15 days

We counted 273 reviews for this product over the span of 708 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 15 days exceeding this threshold:

• 13 Reviews on Aug 22, 2015 (Avg. rating: 4.5)
• 11 Reviews on Aug 23, 2015 (Avg. rating: 4.6)
• 10 Reviews on Aug 24, 2015 (Avg. rating: 4.9)
• 10 Reviews on Aug 10, 2015 (Avg. rating: 4.8)
• 10 Reviews on Aug 14, 2015 (Avg. rating: 4.7)
• 9 Reviews on Aug 9, 2015 (Avg. rating: 4.8)
• 9 Reviews on Aug 11, 2015 (Avg. rating: 4.8)
• 9 Reviews on Aug 12, 2015 (Avg. rating: 4.4)
• 9 Reviews on Aug 21, 2015 (Avg. rating: 4.4)
• 7 Reviews on Aug 4, 2015 (Avg. rating: 5.0)
• 7 Reviews on Aug 19, 2015 (Avg. rating: 4.9)
• 7 Reviews on Aug 16, 2015 (Avg. rating: 4.6)
• 6 Reviews on Aug 13, 2015 (Avg. rating: 4.5)
• 5 Reviews on Aug 20, 2015 (Avg. rating: 4.8)
• 5 Reviews on Aug 5, 2015 (Avg. rating: 4.2)
Show All

In total, we found that 127 reviews were created on just 15 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 76%
• Unverified Purchases

208 of the 273 total reviews for this product are unverified purchases. While this is a higher percentage of unverified purchases than we'd expect to see, it does not appear to have a significant impact on the overall rating.

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.

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

• 
• 28%
• Admitted to receiving an incentive

77 of the 273 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.

• 
• 77%
• Used substantial repetitive phrases

210 of the 273 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%
• Substantial overlapping review history

189 of the 273 reviewers have substantial overlapping product review history. While this is more than we'd expect to see, the discrepancy in ratings between these reviewers and reviewers who have a more unique product review history isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Overlapping Review History test.

• 
• 70%
• 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: 69.6% (Avg. rating: 4.6)

In total, we found that 190 reviewers (or 70%) 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.

Brand Repeaters

• 
• 2%
• Reviewed other products from this brand

5 of the 273 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.