The Halo Effect: ... and the Eight Other Business Delusions That Deceive Managers
More product info
From Phil Rosenzweig
Refresh the report to view the most up-to-date data available:
Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in Management & Leadership with authentic reviews:
Report Card
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Most Trusted Reviews
TRUST
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Unverified Purchaser
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Take-Back Reviewer (2 deleted Reviews; avg. rating: 2.0)
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Overlapping Review History: reviewed 2 of 9 top products
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Critical Reviewer (avg. rating: 3.0)
Least Trusted Reviews
TRUST
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Unverified Purchaser
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Created on a high volume day
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Contains repetitive phrases (
show)
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Overlapping Review History: reviewed 1 of 9 top products
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Overrepresented Participation (posted 7 Reviews)
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Critical Reviewer (avg. rating: 3.3)
Analysis Details
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Never-Verified Reviewers
31 of the 129 reviewers have never written a verified purchase review. While this is more Never-Verified Reviewers than we'd expect to see, the discrepancy in ratings between the Never-Verified Reviewers and reviewers who have written at least one verified purchase review isn't significant enough to rule out the possibility of it being due to random chance.
Take-Back Reviewers
45 of the 129 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 4.8 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.4. 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.
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We discovered a total of 1 deleted Review for this product, with an average rating of 4. 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.
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- 6%
- Created over 4 days
We counted 129 reviews for this product over the span of 4,768 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 4 days exceeding this threshold:In total, we found that 8 reviews were created on just 4 days. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.
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(5.0/5)
(5.0/5)
(4.8/5)
(4.6/5)
(4.8/5)
(5.0/5)
(5.0/5)
(4.6/5)
(4.9/5)
(4.7/5)
62 of the 129 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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- 34%
- 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 44 reviewers (or 34%) 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.
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62 of the 129 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.
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11% also reviewed:
Execution: The Discipline of Getting Things Done by Larry Bossidy
10% also reviewed:
Predictably Irrational: The Hidden Forces That... by Dr. Dan Ariely
10% also reviewed:
Blue Ocean Strategy, Expanded Edition: How to... by W. Chan Kim
9% also reviewed:
Fooled by Randomness: The Hidden Role of Chance... by Nassim Nicholas Taleb
9% also reviewed:
Steve Jobs by Walter Isaacson
9% also reviewed:
Antifragile: Things That Gain from Disorder by Nassim Nicholas Taleb
9% also reviewed:
The Everything Store: Jeff Bezos and the Age of... by Brad Stone
9% also reviewed:
Think and Grow Rich by Napoleon Hill
from the same brand
43 of the 129 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.
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4.2 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
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Brand Repeaters
10 of the 129 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.