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

Warn Unnatural reviews possible

Original:

2,762 Reviews

Adjusted:

1,587 Reviews

Rank in: Robotic Vacuums
76%
85%

View/Edit Adjustment
How is this calculated
Report Last Updated: Mar 19, 2018
Update Available
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Report Card

Click a test to jump to details

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

Customer service was great but I’ve had two of these ... [Go to full review]
Mar 15, 2018      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 3.9)


Least Trusted Reviews

5/5
So far super duper impressed. We ordered ours right as ... [Go to full review]
Mar 30, 2017      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Single-Day Reviewer (posted all reviews on Mar 30, 2017)
  • Overrepresented Participation (posted 9 reviews)
  • Easy Grader (avg. rating: 4.6)


Analysis Details


Fail Rating Trend

  • 8%
  • Created over 11 days

We counted 2,762 reviews for this product over the span of 482 days, an average of 5.7 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 15 or fewer reviews on any given day.

However, we see the following 11 days exceeding this threshold:In total, we found that 211 reviews were created on just 11 days. The reviews on these high volume days have rated this product an average of 4.5 while reviews from other days have rated this product an average of 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.

from reviews created on high volume days

from reviews created on normal volume days


4.5
4.3


Read more about our Rating Trend test.

Fail Suspicious Reviewers

One-Hit Wonders


318 of the 2,762 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
4.4


Take-Back Reviewers


125 of the 2,762 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


4.2
4.4


Single-Day Reviewers


638 of the 2,762 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 4.5 while all other reviewers rated this product an average of 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.

from single-day reviewers

from non-single-day reviewers


4.5
4.3


Read more about our Suspicious Reviewers test.

Fail Reviewer Participation

  • 40%
  • 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 1106 reviewers (or 40%) 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 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.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.4
4.3


Read more about our Reviewer Participation test.

Warn Deleted Reviews

We discovered a total of 30 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.

Warn 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 4.1, while the average ease score for reviewers in this category is 4.1. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

4.1 Product's Average Ease Score

4.1 Category's Average Ease Score


4.1
4.1


Read more about our Reviewer Ease test.


Pass Unverified Purchases

112 of the 2,762 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


4.3
4.4


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.

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 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:
143 reviews
(5.2%)
37 reviews
(1.3%)
35 reviews
(1.3%)
52 reviews
(1.9%)
Show MoreShow Less
Common Phrases in Titles:
87 reviews
(3.1%)


32 of the 2,762 total reviews for this product use substantial repetitive phrases between them. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.6
4.4


Read more about our Phrase Repetition test.

Pass Overlapping Review History

56 of the 2,762 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


4.3
4.4


Read more about our Overlapping Review History test.

Pass Brand Repeats

Brand Repeaters


16 of the 2,762 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


4.5
4.4


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.


3 of the 2,762 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
4.4


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.