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From Clifford D. Simak
This report was last updated 2/14/2021.
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Report Info:
Note: While Amazon.com claims 1,345 Ratings, we counted 1,011 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".
Report Card
Pass Overall Grade
FAIL Reviewer Participation
WARN Deleted Reviews
WARN Rating Trend
WARN Suspicious Reviewers
PASS Unverified Purchases
PASS Word Count Comparison
PASS Phrase Repetition
PASS Overlapping Review History
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews
Most Trusted Reviews
I really recommend this book, though details are sketchy so ... [Go to full review]
Oct 17, 2018
100%
TRUST
TRUST
- Unverified Purchaser
- Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
- Easy Grader (avg. rating: 4.2)
Least Trusted Reviews
Great plot line but wasted in a predictable linear finish. ... [Go to full review]
Nov 1, 2016
18%
TRUST
TRUST
- Verified Purchaser
- Created on a high volume day
- Overrepresented word count (29 words)
- Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
- Overrepresented Participation (posted 17 Reviews)
- Critical Reviewer (avg. rating: 3.9)
Analysis Details
Fail Reviewer Participation
-
- 47%
- 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 476 reviewers (or 47%) are within an overrepresented participation group. These reviews have rated this product an average of 4.5, while all other reviews have rated this product an average of 4.3. 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.
Warn Deleted Reviews
We discovered a total of 22 deleted Reviews for this product, with an average rating of 4.7. 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.
Warn Rating Trend
-
- 25%
- Created over 64 days
We counted 1,011 reviews for this product over the span of 8,555 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 64 days exceeding this threshold:In total, we found that 251 reviews were created on just 64 days. This is an excessively high number of reviews submitted on these high volume days.
Warn Suspicious Reviewers
Take-Back Reviewers
408 of the 1,011 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.
Pass Unverified Purchases
240 of the 1,011 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
-
- 22%
- Have an overrepresented word count
In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 219 reviews (or 22%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass 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
19 reviews
(4.4/5)
(4.4/5)
35 reviews
(3.7/5)
(3.7/5)
13 reviews
(4.6/5)
(4.6/5)
11 reviews
(4.7/5)
(4.7/5)
25 reviews
(4.5/5)
(4.5/5)
38 of the 1,011 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.
Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
10% also reviewed:
The Martian: Classroom Edition: A Novel by Andy Weir
4% also reviewed:
The Atlantis Gene: A Thriller (The Origin... by A.G. Riddle
4% also reviewed:
Children of Time by Adrian Tchaikovsky
4% also reviewed:
Breakthrough by Michael C. Grumley
4% also reviewed:
CyberStorm: A Novel by Matthew Mather
4% also reviewed:
Seveneves by Neal Stephenson
4% also reviewed:
Wool by Hugh Howey
3% also reviewed:
Ready Player One by Ernest Cline
3% also reviewed:
Three Body Problem The by Liu Cixin
250 of the 1,011 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 4.2, while the average ease score for reviewers in this category is 4.2.
4.2 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
60 of the 1,011 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
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.