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From Robert Masello
This report was last updated 7/9/2020.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: While Amazon.com claims 8,032 Ratings, we counted 8,047 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Warn Overall Grade
FAIL 
Unverified Purchases
Unverified PurchasesFAIL Word Count Comparison
Word Count ComparisonWARN Deleted Reviews
Deleted ReviewsWARN Rating Trend
Rating TrendWARN Suspicious Reviewers
Suspicious ReviewersWARN Reviewer Participation
Reviewer ParticipationPASS Phrase Repetition
Phrase RepetitionPASS Overlapping Review History
Overlapping Review HistoryPASS Reviewer Ease
Reviewer EasePASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized Reviews
Most Trusted Reviews
Thoroughly enjoyed this exciting and mysterious read which I found ... [Go to full review]
Jun 22, 2019
100%
TRUST
TRUST
-
Verified Purchaser
-
Take-Back Reviewer (3 deleted Reviews; avg. rating: 5.0) -
Easy Grader (avg. rating: 4.7)
Critical Reviewer (avg. rating: 4.2)
Least Trusted Reviews
Good story, well written. [Go to full review]
Apr 19, 2016
0%
TRUST
TRUST
-
Unverified Purchaser -
Created on a high volume day -
Overrepresented word count (4 words)
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Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
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Overrepresented Participation (posted 28 Reviews) -
Easy Grader (avg. rating: 4.3)
Analysis Details
Fail Unverified Purchases
Unverified Purchases
2,946 of the 8,047 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.9 while the verified purchasers have rated this product an average of 3.8. 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.
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.
Fail Word Count Comparison
Word Count Comparison
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- 64%
- 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 3 groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 5,141 reviews (or 64%) are within an overrepresented word count group. These reviews have rated this product an average of 3.9, while all other reviews have rated this product an average of 3.8. 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.
Warn Deleted Reviews
Deleted Reviews
We discovered a total of 92 deleted Reviews for this product, with an average rating of 4.2. 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.
4.2 average rating of deleted reviews
Warn Rating Trend
Rating Trend
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- 50%
- Created over 128 days
We counted 8,047 reviews for this product over the span of 1,822 days, an average of 4.4 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 13 or fewer reviews on any given day.
However, we see the following 128 days exceeding this threshold:In total, we found that 4,043 reviews were created on just 128 days. This is an excessively high number of reviews submitted on these high volume days.
Warn Suspicious Reviewers
Suspicious Reviewers
Take-Back Reviewers
2,638 of the 8,047 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.
Warn Reviewer Participation
Reviewer Participation
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- 73%
- From reviewers with an overrepresented participation
We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 5859 reviewers (or 73%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Phrase Repetition
Phrase Repetition
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- 0%
- Used substantial repetitive phrases
0 of the 8,047 total reviews for this product use substantial repetitive phrases between them. 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 Phrase Repetition test.
Read more about our Phrase Repetition test.
Pass Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
3% also reviewed:
Chapter Seven: Lost Boys by Joe Gonzalez
3% also reviewed:
The Dead Key by D. M. Pulley
3% also reviewed:
Werkryt MFi Certified iPhone Charger Lightning... by Werkryt
3% also reviewed:
The Man In The High Castle - Season 1 (4K UHD) by Alexa Davalos
2% also reviewed:
Split Second (Split Second Book 1) by Douglas E. Richards
2% also reviewed:
The Martian: Classroom Edition: A Novel by Andy Weir
2% also reviewed:
Breakthrough by Michael C. Grumley
Does not include products
from the same brand
from the same brand
1,574 of the 8,047 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.
Pass Reviewer Ease
Reviewer Ease
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 4.2, while the average ease score for reviewers in this category is 4.3.
4.2 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
147 of the 8,047 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.
Pass Incentivized Reviews
Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
1 of the 8,047 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.