• 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

• 
• 19%
• Created over 12 days

We counted 539 reviews for this product over the span of 465 days, an average of 1.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 6 or fewer reviews on any given day.

However, we see the following 12 days exceeding this threshold:

• 19 Reviews on Feb 19, 2019 (Avg. rating: 4.5)
• 9 Reviews on Mar 2, 2019 (Avg. rating: 5.0)
• 8 Reviews on Feb 21, 2019 (Avg. rating: 4.8)
• 8 Reviews on Feb 20, 2019 (Avg. rating: 4.6)
• 8 Reviews on Mar 20, 2019 (Avg. rating: 4.6)
• 8 Reviews on Mar 24, 2019 (Avg. rating: 4.5)
• 8 Reviews on Apr 1, 2019 (Avg. rating: 4.5)
• 7 Reviews on Feb 28, 2019 (Avg. rating: 5.0)
• 7 Reviews on Mar 19, 2019 (Avg. rating: 5.0)
• 7 Reviews on Feb 22, 2019 (Avg. rating: 4.9)
• 7 Reviews on Mar 13, 2019 (Avg. rating: 4.9)
• 7 Reviews on Apr 16, 2019 (Avg. rating: 4.7)
Show All

In total, we found that 103 reviews were created on just 12 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

• 
• 36%
• have previously deleted reviews

193 of the 539 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, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.

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. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

• 
• 26%
• Used substantial repetitive phrases

138 of the 539 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.

• 
• 44%
• Unverified Purchases

235 of the 539 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.

• 
• 36%
• Substantial overlapping review history

193 of the 539 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: 29.5% (Avg. rating: 4.7)

In total, we found that 159 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.

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

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

• 
• 3%
• Admitted to receiving an incentive

16 of the 539 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.