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Fail Unnatural reviews detected

Original:

44 Reviews

Adjusted:

6 Reviews

90%
66%

View/Edit Adjustment
How is this calculated
Report Last Updated: Nov 6, 2017
Update Available
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Report Card

Click a test to jump to details

FAIL Suspicious Reviewers
FAIL Reviewer Ease
WARN Rating Trend
WARN Word Count Comparison
WARN Phrase Repetition
WARN Reviewer Participation
PASS Unverified Purchases
PASS Overlapping Review History
PASS Brand Repeats
PASS Incentivized Reviews
PASS Deleted Reviews
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Most Trusted Reviews

Thankful to have found this book. I have been dealing ... [Go to full review]
Oct 29, 2017      
85% TRUST
  • Verified Purchaser
  • Overrepresented word count (43 words)
  • Overrepresented Participation (posted 34 reviews)
  • Easy Grader (avg. rating: 4.8)


Least Trusted Reviews

This book will manage you through the entanglements of intermittent ... [Go to full review]
Oct 31, 2017      
0% TRUST
  • Unverified Purchaser
  • Created on a high volume day
  • Overrepresented word count (58 words)
  • Contains repetitive phrases (show)
  • Never-Verified Reviewer
  • Single-Day Reviewer (posted all reviews on Oct 31, 2017)
  • Overrepresented Participation (posted 6 reviews)
  • Easy Grader (avg. rating: 4.7)


Analysis Details


Fail Suspicious Reviewers

Never-Verified Reviewers


10 of the 44 reviewers have never written a verified purchase review. While this is more Never-Verified Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from never-verified reviewers

from reviewers with at least one verified purchase review


4.5
4.8


Single-Day Reviewers


26 of the 44 reviewers have written multiple reviews but posted all of them on a single day. This is an excessively large percentage of Single-Day Reviewers which may indicate unnatural reviews.

from single-day reviewers

from non-single-day reviewers


4.7
4.7


Read more about our Suspicious Reviewers test.

Fail 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 4.7, while the average ease score for reviewers in this category is 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.

4.7 Product's Average Ease Score

4.3 Category's Average Ease Score


4.7
4.3


Read more about our Reviewer Ease test.


Warn Rating Trend

  • 27%
  • Created over 1 day

We counted 44 reviews for this product over the span of 13 days, an average of 3.4 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 10 or fewer reviews on any given day.

However, we see the following 1 day exceeding this threshold:In total, we found that 12 reviews were created on just 1 day. This is an excessively high number of reviews submitted on these high volume days.

from reviews created on high volume days

from reviews created on normal volume days


4.6
4.8


Read more about our Rating Trend test.

Warn Word Count Comparison

  • 39%
  • 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 17 reviews (or 39%) are within an overrepresented word count group. While this is more reviews from overrepresented word count groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.6
4.8


Read more about our Word Count Comparison test.

Warn Phrase Repetition


25 of the 44 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.6
4.8


Read more about our Phrase Repetition test.

Warn Reviewer Participation

  • 100%
  • 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 44 reviewers (or 100%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.7
N/A


Read more about our Reviewer Participation test.

Pass Unverified Purchases

11 of the 44 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.

from unverified purchasers

from verified purchases


4.6
4.8


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:



20 of the 44 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.7
4.7


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

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, or 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:
  1. 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.
  2. We have no information on reviews that were never published in the first place.
  3. 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.
Read more about the Deleted Reviews test here.


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