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From Harlan Coben
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Most Trusted Reviews
TRUST
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Unverified Purchaser
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Take-Back Reviewer (4 deleted Reviews; avg. rating: 4.5)
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Critical Reviewer (avg. rating: 4.3)
Least Trusted Reviews
TRUST
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Verified Purchaser
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Created on a high volume day
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Overrepresented word count (24 words)
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Contains repetitive phrases (
show)
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Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
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Brand Repeater (2 of 12 reviews for this brand; avg rating: 4.5)
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Overrepresented Participation (posted 12 Reviews)
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Easy Grader (avg. rating: 4.6)
Analysis Details

We discovered a total of 42 deleted Reviews for this product, with an average rating of 4.6. 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:
- 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.
- We have no information on reviews that were never published in the first place.
- 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.

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Approximately 25% of reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.0 while the reviewers who have a more unique product review history rated this product an average of 4.8. 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.

Brand Repeaters
Approximately 30% of 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.

Take-Back Reviewers
Approximately 40% of 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.

Approximately 20% of reviews use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

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- <10%
- Created on high-volume days
Read more about our Rating Trend test.

708 of the 8,366 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.

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- <10%
- Have an overrepresented word count
Read more about our Word Count Comparison test.

4.3 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.

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- <10%
- Admitted to receiving an incentive
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.