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Fail Unnatural reviews detected

Original:

289 Reviews

Adjusted:

34 Reviews

27%
2%

View/Edit Adjustment
How is this calculated
Report Last Updated: Mar 27, 2017
Update Available
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Report Card

Click a test to jump to details

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

Die helfen nicht ich nehme schon seit 1Monat die kapseln ... [Go to full review]
Jan 7, 2016      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 3.5)


Least Trusted Reviews

Fühle mich gut seit dem regelmäßigen Ergänzen mit diesem Produkt. ... [Go to full review]
May 20, 2016      
0% TRUST
  • Unverified Purchaser
  • Overrepresented word count (147 words)
  • Contains repetitive phrases (show)
  • One-Hit Wonder
  • Never-Verified Reviewer
  • Overrepresented Participation (posted 1 review)
  • Easy Grader (avg. rating: 5.0)


Analysis Details


Fail Unverified Purchases

200 of the 289 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.6 while the verified purchasers have rated this product an average of 3.1. 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.

from unverified purchasers

from verified purchases


4.6
3.1


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

One-Hit Wonders


127 of the 289 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 4.5 while the reviewers who have posted more than one review have rated this product an average of 3.9. 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.

from one-hit wonders

from reviewers with more than one review


4.5
3.9


Never-Verified Reviewers


171 of the 289 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 4.7 while the reviewers who have written at least one verified purchase review 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.

from never-verified reviewers

from reviewers with at least one verified purchase review


4.7
3.4


Take-Back Reviewers


11 of the 289 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.

from take-back reviewers

from reviewers without previously deleted reviews


3.9
4.2


Single-Day Reviewers


70 of the 289 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.7 while all other reviewers 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.

from single-day reviewers

from non-single-day reviewers


4.7
4.0


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 4.5, 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.

4.5 Product's Average Ease Score

4.3 Category's Average Ease Score


4.5
4.3


Read more about our Reviewer Ease test.


Fail Word Count Comparison

  • 51%
  • 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 2 groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 146 reviews (or 51%) 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 3.9. 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.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.4
3.9


Read more about our Word Count Comparison test.

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:
2 reviews
(0.7%)
26 reviews
(9.0%)
7 reviews
(2.4%)
22 reviews
(7.6%)
2 reviews
(0.7%)
2 reviews
(0.7%)
10 reviews
(3.5%)
6 reviews
(2.1%)
6 reviews
(2.1%)
Show MoreShow Less
Common Phrases in Titles:
2 reviews
(0.7%)
2 reviews
(0.7%)
8 reviews
(2.8%)
2 reviews
(0.7%)
5 reviews
(1.7%)
2 reviews
(0.7%)
2 reviews
(0.7%)
2 reviews
(0.7%)
3 reviews
(1.0%)
3 reviews
(1.0%)
Show MoreShow Less


129 of the 289 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 3.8. 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.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.6
3.8


Read more about our Phrase Repetition test.

Fail Reviewer Participation

  • 83%
  • From reviewers with an overrepresented participation

We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 240 reviewers (or 83%) are within an overrepresented participation group. These reviews have rated this product an average of 4.4, while all other reviews have rated this product an average of 2.7. 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.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.4
2.7


Read more about our Reviewer Participation test.

Warn Deleted Reviews

We discovered a total of 5 deleted reviews for this product, with an average rating of 4.2. 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.

4.2 average rating of deleted reviews

4.2



Read more about our Deleted Reviews test.

Pass Rating Trend

  • 3%
  • Created over 2 days

We counted 289 reviews for this product over the span of 713 days, an average of 0.4 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.

However, we see the following 2 days exceeding this threshold:In total, we found that 10 reviews were created on just 2 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews created on high volume days

from reviews created on normal volume days


4.0
4.2


Read more about our Rating Trend test.

Pass Overlapping Review History
Does not include products
from the same brand


11 of the 289 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


4.5
4.1


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters


5 of the 289 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.

from Brand Repeaters

from Non-Repeaters


4.6
4.1


Read more about our Brand Repeats test.

Pass Skewed Helpfulness
We examined the average net helpfulness score of negative reviews against the average net helpfulness score of positive reviews. The net helpfulness score is the number of times a review has been marked as helpful minus the number of times a review has been marked as unhelpful. We could not find any statistically significant difference in average net helpfulness score between the negative reviews and positive reviews.

0.0 average net helpfulness for positive reviews

0.0 average net helpfulness for negative reviews


Read more about our Skewed Helpfulness test.


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.


1 of the 289 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.

from incentivized reviews

from non-incentivized reviews


4.0
4.2


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.