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Key Portable Grand Graded-Action USB Keyboard 1
More product info From Yamaha


Rating:
2 Reviews
100% of potentially unnatural reviews removed (Why?)
Adjusted:
Insufficient trustworthy reviews



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Report Card

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

Most Trusted Reviews

We couldn't find any quality reviews

Least Trusted Reviews

This Keyboard is very high tech and has awesome sound ... [Go to full review]
Jan 4, 2011      
0% TRUST
  • Unverified Purchaser
  • Overrepresented word count (40 words)
  • Contains repetitive phrases (show)
  • Take-Back Reviewer (106220 deleted reviews; avg. rating: 4.3)
  • Brand Repeater (39 of 1569231 reviews for this brand; avg rating: 4.1)
  • Overlapping Review History: reviewed 9 of 9 top products
  • Critical Reviewer (avg. rating: 4.2)


Analysis Details

Fail Deleted Reviews

We discovered a total of 28 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.

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 the Deleted Reviews test here.

4.2 average rating of deleted reviews

4.2


Show distribution of deleted reviews

Fail Brand Repeats

Brand Repeaters

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

Brand Monogamists

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

Fail Suspicious Reviewers

One-Hit Wonders

We didn't detect a substantial amount of One Hit Wonders.

Never-Verified Reviewers

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

Take-Back Reviewers

We didn't detect a substantial amount of Take-Back Reviewers.

Single-Day Reviewers

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

Warn Unverified Purchases

2 of the 2 total reviews for this product are unverified purchases. This is an excessively large percentage of unverified purchases and it may indicate unnatural reviews.

from unverified purchasers

from verified purchases


5.0
N/A


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.

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 Titles:
2 reviews
(5.0/5)


2 of the 2 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


5.0
N/A


Read more about our Phrase Repetition test.

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

Does not include products
from the same brand


2 of the 2 reviewers have substantial overlapping product review history. This is an excessively large percentage which may indicate unnatural reviews.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


5.0
N/A


Read more about our Overlapping Review History test.

Pass Rating Trend
  • 0%
  • Created on high-volume days
We didn't notice any signals that would indicate reviews were created unevenly over time.
Read more about our Rating Trend test.

Pass Word Count Comparison

  • 0%
  • Have an overrepresented word count
In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 0 reviews (or 0%) are within an overrepresented word count group. 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 Word Count Comparison test.

Pass Reviewer Participation

  • 0%
  • From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation 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 0, while the average ease score for reviewers in this category is 4.3.

0.0 Product's Average Ease Score

4.3 Category's Average Ease Score


0.0
4.3


Read more about our Reviewer Ease 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.

  • 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, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.


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