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Essential Oil Diffuser,Amir® Aromatherapy Ultrasonic Mist Air Humidifier with Color-changing LED... From Amir Report Feedback

Pass Reviews appear natural

Original:

406 Reviews

Adjusted:

322 Reviews

60%
74%

View/Edit Adjustment
How is this calculated
Report Last Updated: Jul 4, 2017
Update Available
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Report Card

Click a test to jump to details

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

I've had the diffuser for one month and I am ... [Go to full review]
Jan 10, 2017      
100% TRUST
  • Verified Purchaser
  • Easy Grader (avg. rating: 4.8)


Least Trusted Reviews

Great little humidifier! [Go to full review]
Dec 14, 2015      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Overrepresented Participation (posted 9 reviews)
  • Easy Grader (avg. rating: 5.0)


Analysis Details


Fail Deleted Reviews

We discovered a total of 43 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.

Fail Rating Trend

  • 20%
  • Created over 5 days

We counted 406 reviews for this product over the span of 614 days, an average of 0.7 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 5 or fewer reviews on any given day.

However, we see the following 5 days exceeding this threshold:In total, we found that 81 reviews were created on just 5 days. The reviews on these high volume days have rated this product an average of 4.9 while reviews from other days 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 reviews created on high volume days

from reviews created on normal volume days


4.9
4.5


Read more about our Rating Trend test.

Fail Suspicious Reviewers

Take-Back Reviewers


45 of the 406 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

from take-back reviewers

from reviewers without previously deleted reviews


4.6
4.5


Read more about our Suspicious Reviewers test.

Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:

Does not include products
from the same brand


44 of the 406 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.8 while the reviewers who have a more unique product review history 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 reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.8
4.5


Read more about our Overlapping Review History test.

Warn Reviewer Participation

  • 49%
  • 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 197 reviewers (or 49%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, the discrepancy in ratings between reviewers in an overrepresented participation groups and all other reviewers isn’t significant enough to rule out the possibility of it being due to random chance.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.6
4.5


Read more about our Reviewer Participation test.

Pass Unverified Purchases

22 of the 406 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


4.8
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.

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:
6 reviews
Common Phrases in Titles:
10 reviews


10 of the 406 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


4.8
4.5


Read more about our Phrase Repetition 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 4.4, while the average ease score for reviewers in this category is 4.5.

4.4 Product's Average Ease Score

4.5 Category's Average Ease Score


4.4
4.5


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters


11 of the 406 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


4.7
4.5


Read more about our Brand Repeats 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.


5 of the 406 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
4.6


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.