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Foundation
More product info
From Isaac Asimov
This report was last updated 10/25/2021.
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".
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Report Card
Pass Overall Grade
FAIL 
Deleted Reviews
Deleted ReviewsFAIL Suspicious Reviewers
Suspicious ReviewersPASS Rating Trend
Rating TrendPASS 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 ReviewsN/A Reviewer Participation
Reviewer Participation
Most Trusted Reviews
What a delightful read! Literally my only qualm is that ... [Go to full review]
Oct 30, 2020
100%
TRUST
TRUST
-
Unverified Purchaser
-
Take-Back Reviewer (1 deleted Review; avg. rating: 5.0) -
Critical Reviewer (avg. rating: 4.1)
Contains repetitive phrases 
Overlapping Review History: reviewed 1 of 9 top products
Least Trusted Reviews
Amazing book from an amazing series. [Go to full review]
Dec 25, 2014
0%
TRUST
TRUST
-
Verified Purchaser -
Created on a high volume day
-
Single-Day Reviewer (posted all reviews on Dec 25, 2014) -
Brand Repeater (2 of 6 reviews for this brand; avg rating: 5.0) -
Overrepresented Participation (posted 6 Reviews) -
Easy Grader (avg. rating: 4.7)
Brand Loyalist (2 of 4 reviews for this brand; avg rating: 4.5)
Analysis Details
Fail Deleted Reviews
Deleted Reviews
We discovered a total of 286 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.
4.5 average rating of deleted reviews
Fail Suspicious Reviewers
Suspicious Reviewers
Take-Back Reviewers
Approximately 60% of reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.
Pass Rating Trend
Rating Trend
-
- <10%
- Created on high-volume days
We didn't notice any signals that would indicate reviews were created unevenly over time.
Read more about our Rating Trend test.
Read more about our Rating Trend test.
Pass Unverified Purchases
Unverified Purchases
510 of the 9,259 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
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
Common Phrases in Reviews:
Show MoreShow Less
~47% of reviews
~6% of reviews
(3.0/5)
(3.0/5)
~41% of reviews
~6% of reviews
(2.0/5)
(2.0/5)
~250% of reviews
~6% of reviews
(5.0/5)
(5.0/5)
~118% of reviews
~91% of reviews
~26% of reviews
~24% of reviews
~100% of reviews
~91% of reviews
~74% of reviews
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.
Pass Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
>90% also reviewed:
The Hobbit by J. R. R. Tolkien
>90% also reviewed:
Foundation's Edge by Isaac Asimov
~85% also reviewed:
The Ultimate Hitchhiker's Guide to the Galaxy by Douglas Adams
~75% also reviewed:
The Hunger Games (Hunger Games Trilogy, Book 1) by Suzanne Collins
~75% also reviewed:
The Martian: Classroom Edition: A Novel by Andy Weir
~70% also reviewed:
Stranger in a Strange Land by Heinlein, Robert A.
~70% also reviewed:
The Invisible Man by H.G. Wells
~65% also reviewed:
Ender's Game (The Ender Quintet) by Orson Scott Card
~15% also reviewed:
Ready Player One by Ernest Cline
~15% also reviewed:
The Hunger Games Trilogy by Suzanne Collins
<10% also reviewed:
Theodore Boone: The Accused by John Grisham
<10% also reviewed:
Batman & Robin, Vol. 2: Batman vs. Robin by DC Comics
<10% also reviewed:
Hyperion by Dan Simmons
<10% also reviewed:
Patriot by Michael Dorman
<10% also reviewed:
Yaber Stainless Steel Mesh Replacement Band... by YABER
<10% also reviewed:
A Short History of Nearly Everything by Bill Bryson
<10% also reviewed:
The Martian: Classroom Edition: A Novel by Andy Weir
Does not include products
from the same brand
from the same brand
Approximately 40% 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
Less than approximately 10% of 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.
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.