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Vinada加湿器 アロマ 卓上 大容量 スチーム 超音波式 4L リモコン...
More product info From Vinada

Amazon Reviews for Vinada加湿器 アロマ 卓上 大容量 スチーム 超音波式 4L リモコン LEDディスプレイ 空気浄化 薫り拡散器 精油加湿器 空気清浄機 乾燥対策 副鼻腔炎適用 温度&湿度表示/タッチ操作/水不足警告/静音/水漏れ防止/空焚き防止機能付き
Rating:
1,080 Reviews
77% of potentially unnatural reviews removed (Why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Jun 12, 2019
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Show Report History
Note: While Amazon.co.jp claims 1,080 reviews, we counted 1,084 available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

水だけなら大丈夫みたい... [Go to full review]
May 22, 2019      
100% TRUST
  • Verified Purchaser
  • Easy Grader (avg. rating: 4.2)


Least Trusted Reviews

静かですし... [Go to full review]
Nov 17, 2018      
0% TRUST
  • Verified Purchaser
  • Overrepresented word count (38 words)
  • Take-Back Reviewer (1 deleted review; avg. rating: 5.0)
  • Brand Loyalist (4 of 7 reviews for this brand; avg rating: 5.0)
  • Overlapping Review History: reviewed 1 of 9 top products
  • Overrepresented Participation (posted 7 reviews)
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Fail Deleted Reviews

We discovered a total of 210 deleted reviews for this product, with an average rating of 4.1. 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.

4.1 average rating of deleted reviews

4.1


Show distribution of deleted reviews

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 5, 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.

5.0 Product's Average Ease Score

4.2 Category's Average Ease Score


5.0
4.2


Read more about our Reviewer Ease test.


Warn Rating Trend

  • 25%
  • Created over 13 days

We counted 1,084 reviews for this product over the span of 215 days, an average of 5.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 14 or fewer reviews on any given day.

However, we see the following 13 days exceeding this threshold:In total, we found that 268 reviews were created on just 13 days. This is an excessively high number of reviews submitted on these high volume days.

from reviews created on high volume days

from reviews created on normal volume days


5.0
5.0


Read more about our Rating Trend test.

Warn Brand Repeats

Brand Repeaters


372 of the 1,084 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from Brand Repeaters

from Non-Repeaters


5.0
5.0


Brand Loyalists


35 of the 1,084 reviewers have reviewed multiple products but half or more of their reviews are for this brand. While this is more Brand Loyalists than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from Brand Loyalists

from Non-Loyalists


5.0
5.0


Read more about our Brand Repeats test.

Warn Suspicious Reviewers

Take-Back Reviewers


47 of the 1,084 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


5.0
5.0


Read more about our Suspicious Reviewers test.

Warn Word Count Comparison
Word counts are approximated for Hanzi and Kanji


  • 61%
  • 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 657 reviews (or 61%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.

from reviews with an overrepresented word count

from reviews with a properly represented word count


5.0
4.9


Read more about our Word Count Comparison test.

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

Does not include products
from the same brand


726 of the 1,084 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

  • 76%
  • 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 827 reviewers (or 76%) 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
4.9


Read more about our Reviewer Participation test.

Pass Unverified Purchases

41 of the 1,084 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


4.9
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.

N/A Phrase Repetition
We have not yet completed optimization for this test for Hanzi or Kanji.

N/A Incentivized Reviews
We have not yet completed optimization for this test for Hanzi or Kanji.


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