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Eufy RoboVac 11, High Suction, Self-Docking, Self-Charging Robotic Vacuum Cleaner with Drop-Sensing... From Eufy Report Feedback

Pass Reviews appear natural

Original:

1,174 Reviews

Adjusted:

965 Reviews

Rank in: Robotic Vacuums
88%
91%

View/Edit Adjustment
How is this calculated
Last Updated: 7/11/2017
Update Available
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Report Card

Click a test to jump to details

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

very strong vacuum. Suck up everything including pens and small ... [Go to full review]
Jul 8, 2017      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 3.8)


Least Trusted Reviews

Excellent ! Does a great job ! [Go to full review]
Dec 26, 2016      
0% TRUST
  • Unverified Purchaser
  • 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

45 of the 1,174 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.8 while the verified purchasers have rated this product an average of 4.5. 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


4.8
4.5


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 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 4.1. 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.

4.2 Product's Average Ease Score

4.1 Category's Average Ease Score


4.2
4.1


Read more about our Reviewer Ease 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:
58 reviews
(4.9%)
15 reviews
(1.3%)
14 reviews
(1.2%)
14 reviews
(1.2%)
33 reviews
(2.8%)
26 reviews
(2.2%)
23 reviews
(2.0%)
Show MoreShow Less


21 of the 1,174 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 4.5. 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


4.9
4.5


Read more about our Phrase Repetition test.

Warn Deleted Reviews

We discovered a total of 3 deleted reviews for this product, with an average rating of 3.3. 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.

3.3 average rating of deleted reviews

3.3



Read more about our Deleted Reviews test.

Warn Rating Trend

  • 19%
  • Created over 12 days

We counted 1,174 reviews for this product over the span of 230 days, an average of 5.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 14 or fewer reviews on any given day.

However, we see the following 12 days exceeding this threshold:In total, we found that 223 reviews were created on just 12 days. 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


4.5
4.5


Read more about our Rating Trend test.

Warn Suspicious Reviewers

One-Hit Wonders


138 of the 1,174 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


4.3
4.5


Take-Back Reviewers


49 of the 1,174 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


4.3
4.5


Read more about our Suspicious Reviewers test.

Warn Reviewer Participation

  • 39%
  • 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 460 reviewers (or 39%) 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


4.5
4.5


Read more about our Reviewer Participation 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

2% also reviewed:
Product Unavailable by

1% also reviewed:
Amazon Fire TV Stick by

1% also reviewed:
Sunrise by Frank Spotnitz

Does not include products
from the same brand


60 of the 1,174 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
4.5


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters


4 of the 1,174 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


3.8
4.5


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 1,174 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


5.0
4.5


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.