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Yamaha Portable Wireless Speaker (Black)
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From YAMAHA
This report was last updated 6/20/2019.
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Report Info:
Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in MP3 & MP4 Player Accessories with authentic reviews:
Report Card
Warn Overall Grade
FAIL Rating Trend
FAIL Suspicious Reviewers
FAIL Overlapping Review History
WARN Reviewer Ease
WARN Phrase Repetition
WARN Reviewer Participation
PASS Unverified Purchases
PASS Word Count Comparison
PASS Brand Repeats
PASS Incentivized Reviews
PASS Deleted Reviews
Most Trusted Reviews
Would help my tennis game with this speaker playing on ... [Go to full review]
Oct 6, 2014
100%
TRUST
TRUST
- Unverified Purchaser
- Take-Back Reviewer (1 deleted Review; avg. rating: 1.0)
- Critical Reviewer (avg. rating: 4.0)
Least Trusted Reviews
Greatest Album of all time.. Nirvana: Nevermind #AmazonGiveaway [Go to full review]
Aug 5, 2014
7%
TRUST
TRUST
- Unverified Purchaser
- Created on a high volume day
- Contains repetitive phrases (show)
- Never-Verified Reviewer
- Overrepresented Participation (posted 2 Reviews)
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Rating Trend
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- 16%
- Created over 2 days
We counted 67 reviews for this product over the span of 1,358 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.
However, we see the following 2 days exceeding this threshold:In total, we found that 11 reviews were created on just 2 days. The reviews on these high volume days have rated this product an average of 5.0 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.
Fail Suspicious Reviewers
One-Hit Wonders
12 of the 67 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, the discrepancy in ratings between the One-Hit Wonders and reviewers who have posted more than one review isn't significant enough to rule out the possibility of it being due to random chance.
Take-Back Reviewers
18 of the 67 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.
Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
6% also reviewed:
NYNE NB-230 Portable Wireless Bluetooth Boombox by NYNE Multimedia Inc
4% also reviewed:
Logitech 981-000536 G430 7.1 Gaming Headset with... by Logitech
4% also reviewed:
Palette Painting Tray by Chameleon Art Supplies
4% also reviewed:
Klipsch GiG Black Portable Speaker, Black by Klipsch
4% also reviewed:
Symphonized GLXY Premium Genuine Wood in-Ear... by Symphonized
4% also reviewed:
3M Privacy Filter for 12" Macbook (PFNAP001) by 3M
4% also reviewed:
Carol's Daughter Sacred Tiare Sulfate-Free... by Carol's Daughter
Does not include products
from the same brand
from the same brand
11 of the 67 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 3.5 while the reviewers who have a more unique product review history rated this product an average of 4.4. 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.
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 4.3, while the average ease score for reviewers in this category is 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.
4.3 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
Warn 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:
Show MoreShow Less
2 reviews
(5.0/5)
(5.0/5)
3 reviews
(4.0/5)
(4.0/5)
2 reviews
(5.0/5)
(5.0/5)
2 reviews
(5.0/5)
(5.0/5)
2 reviews
(4.0/5)
(4.0/5)
2 reviews
(3.0/5)
(3.0/5)
2 reviews
(3.0/5)
(3.0/5)
3 reviews
(5.0/5)
(5.0/5)
2 reviews
(4.5/5)
(4.5/5)
2 reviews
(4.5/5)
(4.5/5)
Common Phrases in Titles:
2 reviews
(4.0/5)
(4.0/5)
13 of the 67 total reviews for this product use substantial repetitive phrases between them. While this is more than we'd expect to see, the discrepancy in ratings between the these reviews and reviews without substantial repetitive phrases isn't significant enough to rule out the possibility of it being due to random chance.
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 26 reviewers (or 39%) 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.
Pass Unverified Purchases
18 of the 67 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.
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.
Read more about our Word Count Comparison test.
Pass Brand Repeats
Brand Repeaters
4 of the 67 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.
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.
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:
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- 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.
- We have no information on reviews that were never published in the first place.
- 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.