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Humble Pi: When Math Goes Wrong in the Real World
More product info
From Matt Parker
This report was last updated 12/15/2021.
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: We only analyze "reviews" and ignore one-tap "ratings".
*This is only a Preliminary Report
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Report Card
Pass Overall Grade
WARN 
Rating Trend
Rating TrendWARN Suspicious Reviewers
Suspicious ReviewersPASS Unverified Purchases
Unverified PurchasesPASS Word Count Comparison
Word Count ComparisonPASS Phrase Repetition
Phrase RepetitionPASS Overlapping Review History
Overlapping Review HistoryPASS Reviewer Ease
Reviewer EasePASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized ReviewsPASS Deleted Reviews
Deleted ReviewsN/A Reviewer Participation
Reviewer Participation
Most Trusted Reviews
This version crashes the kindle reader running on Android.This happens ... [Go to full review]
Jan 21, 2020
100%
TRUST
TRUST
-
Verified Purchaser
-
Critical Reviewer (avg. rating: 2.3)
Unverified Purchaser
Overrepresented word count (49 words)
Take-Back Reviewer (17 deleted Reviews; avg. rating: 4.5)
Easy Grader (avg. rating: 4.6)
Overlapping Review History: reviewed 6 of 9 top products
Brand Repeater (2 of 7 reviews for this brand; avg rating: 3.0)
Least Trusted Reviews
This is a great comedy book and math book. You ... [Go to full review]
Jan 25, 2020
5%
TRUST
TRUST
-
Verified Purchaser
-
Created on a high volume day
Reviewer data not yet gathered.
Overrepresented Participation (posted 2 Reviews)
Contains repetitive phrases 
Analysis Details
Warn Rating Trend
Rating Trend
There are indications that the reviews may have been created unevenly over time.
Read more about our Rating Trend test.
Read more about our Rating Trend test.
Warn Suspicious Reviewers
Suspicious Reviewers
Take-Back Reviewers
Approximately 30% of 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.
Pass Unverified Purchases
Unverified Purchases
38 of the 959 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
-
- <10%
- 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
-
- <10%
- Used substantial repetitive phrases
Less than approximately 10% of reviews 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 Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
<10% also reviewed:
Thinking, Fast and Slow by Daniel Kahneman
<10% also reviewed:
The Signal and the Noise: Why So Many Predictions... by Nate Silver
<10% also reviewed:
Sapiens: THE MULTI-MILLION COPY BESTSELLER by Yuval Noah Harari
<10% also reviewed:
How We Got to Now: Six Innovations That Made the... by Steven Johnson
<10% also reviewed:
Man's Search For Meaning, Gift Edition by Viktor E. Frankl
<10% also reviewed:
Astrophysics for People in a Hurry by Neil deGrasse Tyson
<10% also reviewed:
Subliminal: How Your Unconscious Mind Rules Your... by Leonard Mlodinow
<10% also reviewed:
Grit: (Vermilion Life Essentials) by Angela Duckworth
<10% also reviewed:
The Righteous Mind: Why Good People Are Divided... by Jonathan Haidt
Approximately 15% of 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.
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 4.3.
4.2 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
We didn't detect a substantial amount of Brand Repeaters.
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.
-
- <10%
- 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.