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From Sun Tzu
This report was last updated 7/4/2020.
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 4,019 Ratings, we counted 4,018 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 
Suspicious Reviewers
Suspicious ReviewersFAIL Overlapping Review History
Overlapping Review HistoryWARN Rating Trend
Rating TrendWARN Reviewer Participation
Reviewer ParticipationPASS Unverified Purchases
Unverified PurchasesPASS Word Count Comparison
Word Count ComparisonPASS Phrase Repetition
Phrase RepetitionPASS Reviewer Ease
Reviewer EasePASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized ReviewsPASS Deleted Reviews
Deleted Reviews
Most Trusted Reviews
Great read for anyone..... [Go to full review]
Jul 4, 2019
100%
TRUST
TRUST
-
Verified Purchaser
-
Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0) -
Easy Grader (avg. rating: 4.9)
Critical Reviewer (avg. rating: 4.3)
Least Trusted Reviews
Books are always a great way to go. You can ... [Go to full review]
Mar 14, 2014
0%
TRUST
TRUST
-
Verified Purchaser
-
Single-Day Reviewer (posted all reviews on Mar 14, 2014) -
Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
-
Overlapping Review History: reviewed 1 of 9 top products -
Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Suspicious Reviewers
Suspicious Reviewers
One-Hit Wonders
260 of the 4,018 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.3 while the reviewers who have posted more than one review have 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
1,430 of the 4,018 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.3 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.0. 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.
Single-Day Reviewers
144 of the 4,018 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.3 while all other reviewers 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:
3% also reviewed:
The Prince by Niccolò Machiavelli
2% also reviewed:
The Hunger Games (Hunger Games Trilogy, Book 1) by Suzanne Collins
2% also reviewed:
How to Win Friends and Influence People by Dale Carnegie
2% also reviewed:
The Sign of the Four (Sherlock Holmes Book 2) by Sir Arthur Conan Doyle
1% also reviewed:
Amazon Prime Video by Amazon.com
1% also reviewed:
Fire TV Stick bundle with Echo Dot (2nd Gen) -... by Amazon
1% also reviewed:
Think and Grow Rich by Napoleon Hill
Does not include products
from the same brand
from the same brand
483 of the 4,018 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.5 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 Rating Trend
Rating Trend
-
- 8%
- Created over 56 days
We counted 4,018 reviews for this product over the span of 7,854 days, an average of 0.5 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 56 days exceeding this threshold:In total, we found that 330 reviews were created on just 56 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.
Warn Reviewer Participation
Reviewer Participation
-
- 52%
- From reviewers with an overrepresented participation
We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 2070 reviewers (or 52%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Unverified Purchases
Unverified Purchases
547 of the 4,018 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.
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 Phrase Repetition
Phrase Repetition
-
- 0%
- Used substantial repetitive phrases
0 of the 4,018 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 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 4.5.
4.2 Product's Average Ease Score
4.5 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
176 of the 4,018 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. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Pass Deleted Reviews
Deleted Reviews
- 0
- Reviews have been deleted
We have not discovered any deleted reviews for this product.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
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.