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Bluetooth Headphones, Vansky Streamline Series Bluetooth Headset Noise Cancelling Headphones w/... From Vansky Report Feedback

Warn Unnatural reviews possible

Original:

619 Reviews

Adjusted:

473 Reviews

38%
38%

View/Edit Adjustment
How is this calculated
Report Last Updated: Feb 11, 2017
Update Available
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Report Card

Click a test to jump to details

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

They started off really good but one of the earphone ... [Go to full review]
Jan 13, 2017      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 3.2)


Least Trusted Reviews

Really good sound and they stay in fairly well when ... [Go to full review]
Apr 3, 2016      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • One-Hit Wonder
  • Overrepresented Participation (posted 1 review)
  • Critical Reviewer (avg. rating: 3.0)


Analysis Details

Note: While Amazon.co.uk claims 619 reviews, we counted 620 available on their site.

Fail Rating Trend

  • 8%
  • Created over 6 days

We counted 620 reviews for this product over the span of 545 days, an average of 1.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 6 or fewer reviews on any given day.

However, we see the following 6 days exceeding this threshold:In total, we found that 49 reviews were created on just 6 days. The reviews on these high volume days have rated this product an average of 4.7 while reviews from other days 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.

from reviews created on high volume days

from reviews created on normal volume days


4.7
4.1


Read more about our Rating Trend test.

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.


24 of the 620 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 4.8 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.

from incentivized reviews

from non-incentivized reviews


4.8
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.

Fail Suspicious Reviewers

One-Hit Wonders


97 of the 620 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from one-hit wonders

from reviewers with more than one review


4.2
4.2


Take-Back Reviewers


19 of the 620 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 4.7 while the reviewers who don't have any deleted reviews in their history have 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.

from take-back reviewers

from reviewers without previously deleted reviews


4.7
4.2


Read more about our Suspicious Reviewers 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:
18 reviews
(2.9%)
16 reviews
(2.6%)
55 reviews
(8.9%)
18 reviews
(2.9%)
21 reviews
(3.4%)
7 reviews
(1.1%)
6 reviews
(1.0%)
10 reviews
(1.6%)
9 reviews
(1.5%)
7 reviews
(1.1%)
Show MoreShow Less
Common Phrases in Titles:
19 reviews
(3.1%)
15 reviews
(2.4%)


63 of the 620 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 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.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.5
4.1


Read more about our Phrase Repetition test.

Warn Reviewer Participation

  • 46%
  • 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 285 reviewers (or 46%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.1
4.2


Read more about our Reviewer Participation test.

Pass Unverified Purchases

72 of the 620 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


4.4
4.2


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 Word Count Comparison

  • 0%
  • Have an overrepresented word count
We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.

Pass Overlapping Review History

1% also reviewed:
Fire TV Stick by Amazon

1% also reviewed:
Amazon Video by Amazon.com

Does not include products
from the same brand


35 of the 620 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


4.4
4.2


Read more about our Overlapping Review History test.

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 4.2, while the average ease score for reviewers in this category is 4.3.

4.2 Product's Average Ease Score

4.3 Category's Average Ease Score


4.2
4.3


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters

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

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.

0.9 average net helpfulness for positive reviews

0.0 average net helpfulness for negative reviews


Read more about our Skewed Helpfulness test.


Pass Deleted Reviews
  • 0
  • Reviews have been deleted
We have not discovered any deleted reviews for this product.
Read more about our Deleted Reviews test.