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From William Morrow
This report was last updated 9/10/2017.
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Report Info:
Last Updated: Sep 10, 2017
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Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in United States with authentic reviews:
Report Card
Warn Overall Grade
FAIL Suspicious Reviewers
FAIL Overlapping Review History
WARN Rating Trend
WARN Unverified Purchases
WARN Phrase Repetition
PASS Word Count Comparison
PASS Reviewer Participation
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews
PASS Deleted Reviews
Most Trusted Reviews
I tried getting into Laura Lippman's books because they take ... [Go to full review]
Oct 15, 2007
100%
TRUST
TRUST
- Verified Purchaser
- Critical Reviewer (avg. rating: 4.0)
Least Trusted Reviews
The story plays out over several decades, jumping from past ... [Go to full review]
Aug 2, 2005
20%
TRUST
TRUST
- Unverified Purchaser
- Created on a high volume day
- Take-Back Reviewer (4 deleted Reviews; avg. rating: 4.0)
- Brand Repeater (2 of 225 reviews for this brand; avg rating: 3.0)
- Overlapping Review History: reviewed 2 of 9 top products
- Critical Reviewer (avg. rating: 3.7)
Analysis Details
Fail Suspicious Reviewers
Take-Back Reviewers
18 of the 81 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.
Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
17% also reviewed:
What the Dead Know by Harper
15% also reviewed:
American Greetings Happiness Always Birthday Card... by American Greetings
14% also reviewed:
The Brass Verdict (A Lincoln Lawyer Novel Book 2) by Michael Connelly
12% also reviewed:
The Closers (Harry Bosch) by PowerbookMedic
11% also reviewed:
The Last Coyote (A Harry Bosch Novel) by Michael Connelly
11% also reviewed:
The Narrows (A Harry Bosch Novel) by Michael Connelly
30 of the 81 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.2 while the reviewers who have a more unique product review history rated this product an average of 3.4. 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.
Warn Rating Trend
-
- 7%
- Created over 3 days
We counted 81 reviews for this product over the span of 4,209 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 3 days exceeding this threshold:In total, we found that 6 reviews were created on just 3 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.
Warn Unverified Purchases
53 of the 81 total reviews for this product are unverified purchases. While this is a higher percentage of unverified purchases than we'd expect to see, it does not appear to have a significant impact on the overall rating.
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.
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
3 reviews
2 reviews
5 reviews
8 reviews
3 reviews
2 reviews
2 reviews
8 reviews
3 reviews
2 reviews
Common Phrases in Titles:
3 reviews
29 of the 81 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
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 Reviewer Participation
-
- 0%
- From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.
Read more about our Reviewer Participation test.
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, while the average ease score for reviewers in this category is 4.2.
4.0 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
20 of the 81 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.
Pass 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.