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Blood Defense (Samantha Brinkman Book 1)
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From Marcia Clark
This report was last updated 8/20/2020.
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: While Amazon.com claims 5,591 Ratings, we counted 5,297 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
Warn Overall Grade
FAIL Unverified Purchases
FAIL Suspicious Reviewers
FAIL Phrase Repetition
WARN Deleted Reviews
WARN Rating Trend
WARN Reviewer Participation
PASS Word Count Comparison
PASS Overlapping Review History
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews
Most Trusted Reviews
One of things that bothers me about mystery novels is ... [Go to full review]
Jul 7, 2017
100%
TRUST
TRUST
- Verified Purchaser
- Take-Back Reviewer (34 deleted Reviews; avg. rating: 4.6)
- Easy Grader (avg. rating: 4.5)
Least Trusted Reviews
I honestly did not want to put this book down ... [Go to full review]
Feb 8, 2018
0%
TRUST
TRUST
- Unverified Purchaser
- Contains repetitive phrases (show)
- Never-Verified Reviewer
- Overlapping Review History: reviewed 1 of 9 top products
- Overrepresented Participation (posted 12 Reviews)
- Easy Grader (avg. rating: 4.9)
Analysis Details
Fail Unverified Purchases
586 of the 5,297 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.3 while the verified purchasers have rated this product an average of 4.1. 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.
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.
Fail Suspicious Reviewers
Never-Verified Reviewers
58 of the 5,297 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 4.4 while the reviewers who have written at least one verified purchase review rated this product an average of 4.1. 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
2,065 of the 5,297 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.
Fail Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
646 of the 5,297 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.6 while reviews without substantial repetitive phrases rated this product an average of 4.0. 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 79 deleted Reviews for this product, with an average rating of 4.3. 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
-
- 74%
- Created over 98 days
We counted 5,297 reviews for this product over the span of 1,590 days, an average of 3.3 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 11 or fewer reviews on any given day.
However, we see the following 98 days exceeding this threshold:In total, we found that 3,905 reviews were created on just 98 days. This is an excessively high number of reviews submitted on these high volume days.
Warn Reviewer Participation
-
- 54%
- 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 2868 reviewers (or 54%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Word Count Comparison
-
- 24%
- 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 1,251 reviews (or 24%) 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 Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
6% also reviewed:
Chapter Seven: Lost Boys by Joe Gonzalez
5% also reviewed:
My Sister's Grave (Tracy Crosswhite Book 1) by Robert Dugoni
3% also reviewed:
An Innocent Client: A Legal Thriller (Joe Dillard... by Scott Pratt
3% also reviewed:
Exhume (Dr. Schwartzman Book 1) by Danielle Girard
3% also reviewed:
The Girl in the Ice: A gripping serial killer... by Robert Bryndza
3% also reviewed:
The Dead Key by D. M. Pulley
3% also reviewed:
Bosch Season 2 - Official Trailer by Titus Welliver
3% also reviewed:
Blood on the Tracks (Sydney Rose Parnell Book 1) by Barbara Nickless
Does not include products
from the same brand
from the same brand
1,361 of the 5,297 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 4.3.
4.3 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
81 of the 5,297 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.
13 of the 5,297 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. 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 Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.