The Secret of Our Success: How Culture Is Driving Human Evolution, Domesticating Our Species, and...
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From Joseph Henrich
Refresh the report to view the most up-to-date data available:
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Most Trusted Reviews
TRUST
- Verified Purchaser
- Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
- Critical Reviewer (avg. rating: 2.6)
Least Trusted Reviews
TRUST
- Unverified Purchaser
- Contains repetitive phrases (show)
- Never-Verified Reviewer
- Overlapping Review History: reviewed 2 of 9 top products
- Critical Reviewer (avg. rating: 4.2)
Analysis Details
Never-Verified Reviewers
4 of the 46 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 3.8 while the reviewers who have written at least one verified purchase review rated this product an average of 4.9. 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 Loyalists
1 of the 46 reviewers have reviewed multiple products but half or more of their reviews are for this brand. While this is more Brand Loyalists than we'd expect to see, the discrepancy in ratings between the Brand Loyalists and non-loyalists isn't significant enough to rule out the possibility of it being due to random chance.
(5.0/5)
(4.8/5)
(5.0/5)
(5.0/5)
(5.0/5)
(5.0/5)
(4.7/5)
(5.0/5)
(5.0/5)
24 of the 46 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
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- 74%
- 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 34 reviewers (or 74%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
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- 4%
- Created over 1 day
We counted 46 reviews for this product over the span of 1,987 days, an average of 0.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 1 or fewer reviews on any given day.
However, we see the following 1 day exceeding this threshold:In total, we found that 2 reviews were created on just 1 day. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
7 of the 46 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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- 0%
- Have an overrepresented word count
Read more about our Word Count Comparison test.
9% also reviewed:
The Enigma of Reason by Hugo Mercier
9% also reviewed:
Sapiens: THE MULTI-MILLION COPY BESTSELLER by Yuval Noah Harari
7% also reviewed:
Our Final Invention: Artificial Intelligence and... by James Barrat
4% also reviewed:
The Robot's Rebellion: Finding Meaning in the Age... by Keith E. Stanovich
4% also reviewed:
Superintelligence by Nick Bostrom
4% also reviewed:
Valley of Genius: The Uncensored History of... by Adam Fisher
4% also reviewed:
The Book of Why: The New Science of Cause and... by Judea Pearl
4% also reviewed:
The Master Algorithm: How the Quest for the... by Pedro Domingos
4% also reviewed:
The Martian: Classroom Edition: A Novel by Andy Weir
13 of the 46 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.
4.4 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
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- 0%
- 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.
- 0
- Reviews have been deleted
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.