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This report was last updated 4/15/2019.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
Brigade Warning!:
Our algorithm has detected a large amount of suspicious negative reviews. Learn more about Review Brigades.
Our algorithm has detected a large amount of suspicious negative reviews. Learn more about Review Brigades.
View/Edit Adjustment
Jump to Report Card
Report Info:
Note: While Amazon.com claims 4,107 reviews, we counted 4,125 available on their site.
Report Card
Fail Overall Grade
FAIL 
Deleted Reviews
Deleted ReviewsFAIL Rating Trend
Rating TrendFAIL Unverified Purchases
Unverified PurchasesFAIL Suspicious Reviewers
Suspicious ReviewersFAIL Phrase Repetition
Phrase RepetitionFAIL Overlapping Review History
Overlapping Review HistoryWARN Reviewer Participation
Reviewer ParticipationPASS Word Count Comparison
Word Count ComparisonPASS Reviewer Ease
Reviewer EasePASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized Reviews
Most Trusted Reviews
Liked this book [Go to full review]
Jan 22, 2019
100%
TRUST
TRUST
-
Verified Purchaser
-
Easy Grader (avg. rating: 4.6)
Least Trusted Reviews
No stars....lies lies lies! The actual rating is 0 stars! [Go to full review]
Oct 30, 2017
0%
TRUST
TRUST
-
Unverified Purchaser -
Created on a high volume day
-
One-Hit Wonder -
Never-Verified Reviewer -
Take-Back Reviewer (1 deleted review; avg. rating: 1.0) -
Overrepresented Participation (posted 1 review) -
Critical Reviewer (avg. rating: 1.0)
Analysis Details
Fail Deleted Reviews
Deleted Reviews
We discovered a total of 1,382 deleted reviews for this product, with an average rating of 2.3. 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.
2.3 average rating of deleted reviews
Fail Rating Trend
Rating Trend
-
- 67%
- Created over 57 days
We counted 4,125 reviews for this product over the span of 579 days, an average of 7.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 17 or fewer reviews on any given day.
However, we see the following 57 days exceeding this threshold:In total, we found that 2,761 reviews were created on just 57 days. The reviews on these high volume days have rated this product an average of 4.4 while reviews from other days have rated this product an average of 3.6. 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.
Fail Unverified Purchases
Unverified Purchases
841 of the 4,125 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 2.3 while the verified purchasers have rated this product an average of 4.6. 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 Suspicious Reviewers
Suspicious Reviewers
One-Hit Wonders
652 of the 4,125 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.
Never-Verified Reviewers
193 of the 4,125 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 2.1 while the reviewers who have written at least one verified purchase review rated this product an average of 4.2. 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.
Take-Back Reviewers
1,010 of the 4,125 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.
Fail Phrase Repetition
Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
Common Phrases in Reviews:
222 reviews
(4.6/5)
(4.6/5)
42 reviews
(4.5/5)
(4.5/5)
104 reviews
(4.5/5)
(4.5/5)
58 of the 4,125 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.5 while reviews without substantial repetitive phrases rated this product an average of 4.1. 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.
Fail Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
5% also reviewed:
Fire and Fury by Michael Wolff
2% also reviewed:
Becoming by Michelle Obama
2% also reviewed:
A Higher Loyalty: Truth, Lies, and Leadership by James Comey
2% also reviewed:
Fear: Trump in the White House by Bob Woodward
2% also reviewed:
Unbelievable: My Front-Row Seat to the Craziest... by Katy Tur
2% also reviewed:
Al Franken, Giant of the Senate by Al Franken
1% also reviewed:
Hillbilly Elegy: A Memoir of a Family and Culture... by J. D. Vance
1% also reviewed:
All the Light We Cannot See: A Novel by Anthony Doerr
Does not include products
from the same brand
from the same brand
536 of the 4,125 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.4 while the reviewers who have a more unique product review history rated this product an average of 4.1. 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 Reviewer Participation
Reviewer Participation
-
- 45%
- 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:In total, we found that 1867 reviewers (or 45%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.
Pass Word Count Comparison
Word Count Comparison
-
- 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.
Read more about our Word Count Comparison test.
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 4.1, while the average ease score for reviewers in this category is 4.4.
4.1 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
101 of the 4,125 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.
-
- 0%
- Admitted to receiving an incentive
We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Read more about our Incentivized Reviews test, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.