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Behind Closed Doors: The gripping psychological thriller everyone is raving about
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From B A Paris
This report was last updated 11/20/2018.
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Report Info:
Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in Thrillers with authentic reviews:
Report Card
Fail Overall Grade
FAIL Incentivized Reviews
FAIL Word Count Comparison
FAIL Phrase Repetition
WARN Deleted Reviews
WARN Rating Trend
WARN Suspicious Reviewers
WARN Reviewer Participation
PASS Unverified Purchases
PASS Overlapping Review History
PASS Reviewer Ease
PASS Brand Repeats
Most Trusted Reviews
Great read [Go to full review]
Jul 25, 2018
100%
TRUST
TRUST
- Verified Purchaser
- Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
- Easy Grader (avg. rating: 4.7)
Least Trusted Reviews
Couldn't put this book down! A really excellent storyline, gripping ... [Go to full review]
Mar 20, 2016
0%
TRUST
TRUST
- Verified Purchaser
- Created on a high volume day
- Overrepresented word count (20 words)
- Contains repetitive phrases (show)
- Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
- Overlapping Review History: reviewed 3 of 9 top products
- Overrepresented Participation (posted 9 Reviews)
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
28 of the 8,696 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. Incentivized reviews have rated this product an average of 4.7 while reviews that were not incentivized rated this product an average of 4.2. 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.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Fail Word Count Comparison
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- 63%
- 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 3 groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 5,477 reviews (or 63%) are within an overrepresented word count group. These reviews have rated this product an average of 4.4, while all other reviews have 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.
Fail 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
995 reviews
(4.9/5)
(4.9/5)
268 reviews
(4.9/5)
(4.9/5)
285 reviews
(4.9/5)
(4.9/5)
245 reviews
(4.9/5)
(4.9/5)
263 reviews
(4.6/5)
(4.6/5)
187 reviews
(4.8/5)
(4.8/5)
288 reviews
(4.8/5)
(4.8/5)
101 reviews
(4.9/5)
(4.9/5)
145 reviews
(4.8/5)
(4.8/5)
104 reviews
(4.9/5)
(4.9/5)
1,980 of the 8,696 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.9 while reviews without substantial repetitive phrases 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.
Warn Deleted Reviews
We discovered a total of 98 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.
Warn Rating Trend
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- 51%
- Created over 108 days
We counted 8,696 reviews for this product over the span of 1,026 days, an average of 8.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 19 or fewer reviews on any given day.
However, we see the following 108 days exceeding this threshold:In total, we found that 4,463 reviews were created on just 108 days. This is an excessively high number of reviews submitted on these high volume days.
Warn Suspicious Reviewers
Take-Back Reviewers
174 of the 8,696 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 Reviewer Participation
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- 90%
- From reviewers with an overrepresented participation
We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 7835 reviewers (or 90%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Unverified Purchases
880 of the 8,696 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 Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
8% also reviewed:
The Girl on the Train by Paula Hawkins
3% also reviewed:
Between You and Me: A psychological thriller with... by Lisa Hall
3% also reviewed:
Me Before You by Jojo Moyes
3% also reviewed:
Gone Girl by Gillian Flynn
3% also reviewed:
While My Eyes Were Closed: The #1 Bestseller by Linda Green
2% also reviewed:
The Husband's Secret by Liane Moriarty
2% also reviewed:
Fifty Shades of Grey: The #1 Sunday Times... by E L James
2% also reviewed:
The Lie by Harper Collins
Does not include products
from the same brand
from the same brand
1,612 of the 8,696 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 4.4.
4.3 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
158 of the 8,696 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.