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Prelude to Foundation
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From Isaac Asimov
This report was last updated 10/11/2019.
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Report Info:
Note: While Amazon.com claims 322 Ratings, we counted 321 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in Classics with authentic reviews:
Report Card
Pass Overall Grade
FAIL Deleted Reviews
FAIL Brand Repeats
FAIL Suspicious Reviewers
WARN Phrase Repetition
WARN Reviewer Participation
PASS Rating Trend
PASS Unverified Purchases
PASS Word Count Comparison
PASS Overlapping Review History
PASS Reviewer Ease
PASS Incentivized Reviews
Most Trusted Reviews
It's Asimov! One of my most favorite books ever by ... [Go to full review]
Jan 11, 2018
100%
TRUST
TRUST
- Unverified Purchaser
- Take-Back Reviewer (2 deleted Reviews; avg. rating: 3.0)
- Critical Reviewer (avg. rating: 4.0)
Least Trusted Reviews
Prelude to Foundation by Isaac Asimov, one of the most ... [Go to full review]
Feb 17, 2004
0%
TRUST
TRUST
- Unverified Purchaser
- Created on a high volume day
- Contains repetitive phrases (show)
- Never-Verified Reviewer
- Single-Day Reviewer (posted all reviews on Feb 17, 2004)
- Brand Monogamist (3 of 3 reviews for this brand; avg rating: 5.0)
- Overrepresented Participation (posted 3 Reviews)
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Deleted Reviews
We discovered a total of 38 deleted Reviews for this product, with an average rating of 4.6. 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.
Fail Brand Repeats
Brand Repeaters
134 of the 321 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, the discrepancy in ratings between the Brand Repeaters and non-repeaters isn't significant enough to rule out the possibility of it being due to random chance.
Brand Loyalists
15 of the 321 reviewers have reviewed multiple products but half or more of their reviews are for this brand. This is an excessively large percentage of Brand Loyalists which may indicate unnatural reviews.
Brand Monogamists
7 of the 321 reviewers have reviewed multiple products, but only for this brand. This is an excessively large percentage of Brand Monogamists which may indicate unnatural reviews.
Fail Suspicious Reviewers
One-Hit Wonders
24 of the 321 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 4.8 while the reviewers who have posted more than one review 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.
Take-Back Reviewers
111 of the 321 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, it does not appear to have a significant impact on the overall rating.
Warn 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
4 reviews
(5.0/5)
(5.0/5)
2 reviews
(5.0/5)
(5.0/5)
71 reviews
(4.4/5)
(4.4/5)
22 reviews
(4.4/5)
(4.4/5)
17 reviews
(4.6/5)
(4.6/5)
2 reviews
(5.0/5)
(5.0/5)
2 reviews
(5.0/5)
(5.0/5)
15 reviews
(4.1/5)
(4.1/5)
8 reviews
(4.3/5)
(4.3/5)
17 reviews
(4.4/5)
(4.4/5)
105 of the 321 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
Warn Reviewer Participation
-
- 51%
- 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 165 reviewers (or 51%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Rating Trend
-
- 1%
- Created over 1 day
We counted 321 reviews for this product over the span of 7,913 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 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.
Pass Unverified Purchases
122 of the 321 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
-
- 0%
- 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 Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
10% also reviewed:
The Hobbit: The Battle of the Five Armies... by Weta
7% also reviewed:
Ender's Game (The Ender Quintet) by Orson Scott Card
6% also reviewed:
The Chronicles of Narnia Box Set: Full-Color... by C. S. Lewis
6% also reviewed:
Harry Potter and the Sorcerer's Stone by J.K. Rowling
6% also reviewed:
The Naked Sun (The Robot Series) by Asimov, Isaac
6% also reviewed:
Mr. Mercedes: A Novel (1) (The Bill Hodges... by Stephen King
6% also reviewed:
Hyperion by Dan Simmons
5% also reviewed:
Childhood's End (Del Rey Impact) by Arthur C. Clarke
Does not include products
from the same brand
from the same brand
64 of the 321 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
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 4.3, while the average ease score for reviewers in this category is 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.
4.3 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
-
- 0%
- 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.