Why the West Rules--for Now: The Patterns of History, and What They Reveal About the Future
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From PowerbookMedic
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Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in Earth Sciences with authentic reviews:
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Most Trusted Reviews
TRUST
- Verified Purchaser
- Overrepresented Participation (posted 5 Reviews)
- Easy Grader (avg. rating: 4.5)
Least Trusted Reviews
We couldn't find any low-quality reviewsAnalysis Details
Take-Back Reviewers
66 of the 201 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.
Single-Day Reviewers
4 of the 201 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 5.0 while all other reviewers 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.
We discovered a total of 2 deleted Reviews for this product, with an average rating of 4.5. 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.
(4.6/5)
(5.0/5)
(3.9/5)
(4.2/5)
(4.1/5)
(4.3/5)
(5.0/5)
(4.1/5)
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(4.5/5)
76 of the 201 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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- 54%
- 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 108 reviewers (or 54%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
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- 0%
- Created on high-volume days
Read more about our Rating Trend test.
70 of the 201 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.
16% also reviewed:
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6% also reviewed:
A History of the Peninsular War, Volume II:... by Sir Charles Oman
5% also reviewed:
1177 B.C.: The Year Civilization Collapsed... by Eric H. Cline
5% also reviewed:
Thinking, Fast and Slow by Daniel Kahneman
5% also reviewed:
Collapse: How Societies Choose to Fail or Succeed by Jared Diamond
4% also reviewed:
The Rational Optimist: How Prosperity Evolves... by Matt Ridley
4% also reviewed:
Zealot: The Life and Times of Jesus of Nazareth by Reza Aslan
4% also reviewed:
Civilization: The West and the Rest by The Penguin Press
from the same brand
45 of the 201 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.
4.0 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
Brand Repeaters
6 of the 201 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.
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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.