The Bell Curve: Intelligence and Class Structure in American Life (A Free Press Paperbacks Book)
More product info
From Richard J. Herrnstein
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Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Most Trusted Reviews
TRUST
- Verified Purchaser
- Critical Reviewer (avg. rating: 4.3)
Least Trusted Reviews
TRUST
- Unverified Purchaser
- Take-Back Reviewer (1 deleted Review; avg. rating: 1.0)
- Overrepresented Participation (posted 11 Reviews)
- Critical Reviewer (avg. rating: 3.0)
Analysis Details
We discovered a total of 90 deleted Reviews for this product, with an average rating of 3.3. 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.
209 of the 445 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.5 while the verified purchasers have rated this product an average of 4.7. 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.
Take-Back Reviewers
154 of the 445 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.
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- 53%
- 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 234 reviewers (or 53%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
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- 1%
- Created over 1 day
We counted 445 reviews for this product over the span of 8,654 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.
However, we see the following 1 day exceeding this threshold:In total, we found that 3 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.
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- 0%
- Have an overrepresented word count
Read more about our Word Count Comparison test.
43 of the 445 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.
4% also reviewed:
Coming Apart: The State of White America,... by Charles Murray
3% also reviewed:
Race, Evolution, and Behavior: A Life History... by J. Philippe Rushton
3% also reviewed:
Outliers, The Story of Success by Malcolm Gladwell
3% also reviewed:
Guns, Germs and Steel: The Fate of Human Societies by Jared Diamond
3% also reviewed:
A Troublesome Inheritance: Genes, Race and Human... by Nicholas Wade
2% also reviewed:
The Selfish Gene by Richard Dawkins
2% also reviewed:
Real Education: Four Simple Truths for Bringing... by Charles Murray
2% also reviewed:
Nickel And Dimed: On (Not) Getting By In America by Barbara Ehrenreich
2% also reviewed:
The Blank Slate: The Modern Denial of Human Nature by Steven Pinker
69 of the 445 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.
4.1 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Brand Repeaters
4 of the 445 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.