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TRAPEST Ultrasonic Electro Magnetic Natural Indoor Pest Control (3 Pack) UK PLUG From Trapest Report Feedback

Fail Unnatural reviews detected

Original:

188 Reviews

Adjusted:

20 Reviews

View/Edit Adjustment
How is this calculated
Last Updated: 1/10/2017
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 Phrase Repetition
FAIL Overlapping Review History
WARN Deleted Reviews
WARN Incentivized Reviews
WARN Word Count Comparison
PASS Rating Trend
PASS Reviewer Participation
PASS Brand Repeats
PASS Skewed Helpfulness

Most Trusted Reviews

Had to unplug these after two days as they were ... [Go to full review]
Dec 1, 2016      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 3.0)


Least Trusted Reviews

3/5
My house has 3 stories and many walls so I ... [Go to full review]
Nov 6, 2016      
0% TRUST
  • Unverified Purchaser
  • Overrepresented word count (124 words)
  • Take-Back Reviewer (1 deleted review; avg. rating: 5.0)
  • Overlapping Review History: reviewed 6 of 9 top products
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Note: While Amazon.co.uk claims 188 reviews, we counted 110 available on their site.

Fail Unverified Purchases

88 of the 110 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 2.4. 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 unverified purchasers

from verified purchases


4.6
2.4


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

Take-Back Reviewers


43 of the 110 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.5 while the reviewers who don't have any deleted reviews in their history 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 take-back reviewers

from reviewers without previously deleted reviews


4.5
3.9


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 4.6, 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.

4.6 Product's Average Ease Score

4.3 Category's Average Ease Score


4.6
4.3


Read more about our Reviewer Ease test.


Fail Phrase Repetition


39 of the 110 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.5 while reviews without substantial repetitive phrases 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 substantial repetitive phrases

from reviews without substantial repetitive phrases


4.5
3.9


Read more about our Phrase Repetition test.

Fail Overlapping Review History


73 of the 110 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.5 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.5
3.4


Read more about our Overlapping Review History test.

Warn Deleted Reviews

We discovered a total of 2 deleted reviews for this product, with an average rating of 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.

5.0 average rating of deleted reviews

5.0



Read more about our Deleted Reviews test.

Warn Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.


6 of the 110 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. While we could not find a statistically significant difference between the average rating of incentivized reviews and non-incentivized reviews, the presences of at least one incentivized review indicates that there may be more, since not all reviewers will disclose that they had received an incentive to post a review.

from incentivized reviews

from non-incentivized reviews


4.3
4.1


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.

Warn Word Count Comparison

  • 32%
  • 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 35 reviews (or 32%) are within an overrepresented word count group. While this is more reviews from overrepresented word count groups than we'd expect to see, the discrepancy in ratings between reviews with overrepresented word groups and all other reviews isn’t significant enough to rule out the possibility of it being due to random chance.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.4
4.0


Read more about our Word Count Comparison test.

Pass Rating Trend

  • 0%
  • Created on high-volume days
We counted 110 reviews for this product over the span of 64 days, an average of 1.7 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 7 or fewer reviews on any given day. We didn't find any days exceeding this threshold.
Read more about our Rating Trend test.

Pass Reviewer Participation

  • 16%
  • 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 18 reviewers (or 16%) are within an overrepresented participation group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.3
4.1


Read more about our Reviewer Participation test.

Pass Brand Repeats

Brand Repeaters


3 of the 110 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


5.0
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.

-0.3 average net helpfulness for positive reviews

0.0 average net helpfulness for negative reviews


Read more about our Skewed Helpfulness test.