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White Noise Machine, Sleep Sound Therapy Machine with 26 High Fidelity Nature Sounds, Portable USB...
More product info From KAILEDI.

Amazon Reviews for  White Noise Machine, Sleep Sound Therapy Machine with 26 High Fidelity Nature Sounds, Portable USB Output Charger, Sleep Sound Therapy for Home,Office,Travel,Baby,Kids and Adults
Rating:
30 Ratings
21 Reviews
("Ratings" vs. "Reviews")
86% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Sep 12, 2020
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Note: While Amazon.com claims 30 Ratings, we counted 21 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

This little machine has a nice variety of sounds and ... [Go to full review]
Aug 10, 2020      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (3 deleted Reviews; avg. rating: 3.7)
  • Easy Grader (avg. rating: 4.9)


Least Trusted Reviews

We couldn't find any low-quality reviews

Analysis Details

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

4.9 Product's Average Ease Score

4.2 Category's Average Ease Score


4.9
4.2


Read more about our Reviewer Ease test.


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

Does not include products
from the same brand


12 of the 21 reviewers have substantial overlapping product review history. While this is more than we'd expect to see, the discrepancy in ratings between these reviewers and reviewers who have a more unique product review history isn't significant enough to rule out the possibility of it being due to random chance.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


5.0
4.9


Read more about our Overlapping Review History test.

Warn Reviewer Participation

  • 90%
  • From reviewers with an overrepresented participation

We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 19 reviewers (or 90%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


5.0
5.0


Read more about our Reviewer Participation test.

Pass Rating Trend

  • 0%
  • Created on high-volume days
We counted 21 reviews for this product over the span of 503 days, an average of 0.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day. We didn't find any days exceeding this threshold.
Read more about our Rating Trend test.

Pass Unverified Purchases

1 of the 21 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


5.0
5.0


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
  • 0%
  • Used substantial repetitive phrases
0 of the 21 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.
Read more about our Phrase Repetition test.

Pass Suspicious Reviewers

One-Hit Wonders


1 of the 21 reviewers have only reviewed this product. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from one-hit wonders

from reviewers with more than one review


5.0
5.0


Never-Verified Reviewers

We didn't detect a substantial amount of Never-Verified Reviewers.

Take-Back Reviewers


3 of the 21 reviewers have had at least one of their past reviews for another product deleted. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from take-back reviewers

from reviewers without previously deleted reviews


5.0
4.9


Single-Day Reviewers

We didn't detect a substantial amount of Single-Day Reviewers.

Pass Brand Repeats

Brand Repeaters

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

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.

  • 0%
  • Admitted to receiving an incentive
We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

Pass Deleted Reviews
  • 0
  • Reviews have been deleted
We have not discovered any deleted reviews for this product.

There are a few limitations to keep in mind regarding the Deleted Reviews test:
  1. We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
  2. We have no information on reviews that were never published in the first place.
  3. We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
Read more about our Deleted Reviews test.